Here are the relevant passages to study, which occur in 2 Baruch and 4 Ezra:
From 2 Barukh:
Chapter forty four
And they will participate in the consolation of Zion. 8 For that which is now is nothing. But that which is in the future will be very great. 9 For everything will pass away which is corruptible, and everything that dies will go away, and all present time will be forgotten, and there will be no remembrance of the present time which is polluted by evils. 10 For he who runs now runs in vain and he who is happy will fall quickly and be humiliated. 11 For that which will be in the future, that is what one will look for, and that which comes later, that is what we shall hope for. For there is a time that does not pass away. 12 And that period is coming which will remain forever; and there is the new world which does not carry back to corruption those who enter into its beginning, and which has no mercy on those who come into torment of those who are living in it, and it does not carry to perdition. 13 For those are the ones who will inherit this time of which it is spoken, and to these
is the heritage of the promised time. 14 These are they who prepared for themselves treasures of wisdom. And stores of insight are found with them. 15 And they have not withdrawn form mercy and
they have preserved the truth of the Law. For the coming world will be given to these, but the habitation of the many others will be in the fire.
4 Ezra:
From ch. 2: (This passage shows perhaps some signs of Christian redaction, being influenced by Revelation, which is very interesting--note how the redactor conflates the 144,000 who were "sealed" with "the great multitude" praising before the throne. The influence could be a source both the Revelation writer and 4 Ezra have in common however. Note the importance of Isaiah 35 and 42.)
[15] "Mother, embrace your sons; bring them up with gladness, as does the dove; establish their feet, because I have chosen you, says the Lord.
[16] And I will raise up the dead from their places, and will bring them out from their tombs, because I recognize my name in them.
[17] Do not fear, mother of sons, for
I have chosen you, says the Lord.
[18] I will send you help, my servants Isaiah and Jeremiah. According to their counsel I have consecrated and prepared for you twelve trees loaded with various fruits,
[19] and the same number of springs flowing with milk and honey, and seven mighty mountains on which roses and lilies grow; by these I will fill your children with joy.
[20]
Guard the rights of the widow, secure justice for the fatherless, give to the needy, defend the orphan, clothe the naked,
[21] care for the injured and the
weak, do not ridicule a
lame man,
**Isaiah 35:3-6** protect the
maimed, and let the
blind man have a vision of my splendor.
**Isaiah 35:5, 42:7**
[22]
Protect the old and the young within your walls;
[23]
When you find any who are dead, commit them to the grave and mark it, and I will give you the first place in my resurrection. **this is "la'asot Hesed", par excellance, btw**
[24] Pause and be quiet, my people, because your rest will come.
[25] Good nurse, nourish your sons, and strengthen their feet.
[26]
Not one of the servants whom I have given you will perish, for I will require them from among your number.
[27] Do not be anxious, for when the day of tribulation and anguish comes, others shall weep and be sorrowful, but you shall rejoice and have abundance.
[28] The nations shall envy you but they shall not be able to do anything against you, says the Lord.
[29]
My hands will cover you, that your sons may not see Gehenna.
[30] Rejoice, O mother, with your sons, because I will deliver you, says the Lord.
[31] Remember your sons that sleep, because I will bring them out of the hiding places of the earth, and will show mercy to them; for I am merciful, says the Lord Almighty.
[32] Embrace your children until I come, and proclaim mercy to them; because my springs run over, and my grace will not fail."
[33] I, Ezra, received a command from the Lord on Mount Horeb to go to Israel. When I came to them they rejected me and refused the Lord's commandment.
[34] Therefore I say to you, O nations that hear and understand, "Await your shepherd; he will give you everlasting rest, because he who will come at the end of the age is close at hand.
[35] Be ready for the rewards of the kingdom, because the eternal light will shine upon you for evermore.
[36] Flee from the shadow of this age, receive the joy of your glory; I publicly call on my Savior to witness.
[37] Receive what the Lord has entrusted to you and be joyful, giving thanks to him who has called you to heavenly kingdoms.
[38]
Rise and stand, and see at the feast of the Lord the number of those who have been sealed.
**Rev 6:4 And I heard the number of those who were sealed. One hundred [and] forty-four thousand of all the tribes of the children of Israel [were] sealed, etc... Rev 14:1 Then I looked, and behold, a Lamb standing on Mount Zion, and with Him one hundred [and] forty-four thousand, having His Father's name written on their foreheads...3 They sang as it were a new song (Isaiah 42:10) before the throne, before the four living creatures, and the elders; and no one could learn that song except the hundred [and] forty-four thousand who were redeemed from the earth. (Isaiah 35:10) 4 These are the ones who were not defiled with women, for they are virgins. These are the ones who follow the Lamb wherever He goes. These were redeemed from [among] men, [being] firstfruits to God and to the Lamb. 5 And in their mouth was found no deceit, for they are without fault before the throne of God. **
[39] Those who have departed from the shadow of this age have received glorious
garments from the Lord.
[40] Take again your full number, O Zion, and conclude the list of your people who are
clothed in white, who have fulfilled the law of the Lord.
[41] The number of your children, whom you desired, is full; beseech the Lord's power that your people, who have been called from the beginning, may be made holy."
[42] I, Ezra,
saw on Mount Zion a great multitude, which I could not number, and they all were praising the Lord with songs. **Rev 6:9 After these things I looked, and behold, a great multitude which no one could number, of all nations, tribes, peoples, and tongues, standing before the throne and before the Lamb, clothed with white robes, with palm branches in their hands, 10 and crying out with a loud voice, saying, "Salvation [belongs] to our God who sits on the throne, and to the Lamb!"**
[43] In their midst was a young man of great stature, taller than any of the others, and on the head of each of them he placed a crown, but he was more exalted than they. And I was held spellbound.
[44]
Then I asked an angel, "Who are these, my lord?" **
Rev 6:13 Then one of the elders answered, saying to me, "Who are these arrayed in white robes, and where did they come from?" 14 And I said to him, "Sir, you know." So he said to me, "These are the ones who come out of the great tribulation, and washed their robes and made them white in the blood of the Lamb.**
[45] He answered and said to me, "These are they who have put off mortal clothing and have put on the immortal, and they have confessed the name of God; now they are being crowned, and
receive palms."
[46] Then I said to the angel, "Who is that young man who places crowns on them and puts
palms in their hands?"
[47] He answered and said to me, "
He is the Son of God, whom they confessed in the world." So I began to praise those who had stood valiantly for the name of the Lord.
[48] Then the angel said to me, "Go, tell my people how great and many are the wonders of the Lord God which you have seen."
From Chapter 7:
[88] "Now this is the order of
those who have kept the ways of the Most High, when they shall be separated from their mortal body.
[89] During the time that they lived in it, they laboriously served the Most High, and withstood danger every hour,
that they might keep the law of the Lawgiver perfectly.
[90] Therefore this is the teaching concerning them:
[91] First of all, they shall see with great joy the glory of him who receives them, for they shall have rest in seven orders.
[92] The first order, because they have striven with great effort to overcome the evil thought which was formed with them, that it might not lead them astray from life into death.
[93] The second order, because they see the perplexity in which the souls of the ungodly wander, and the punishment that awaits them.
[94] The third order, they see the witness which he who formed them bears concerning them, that while they were alive they kept the law which was given them in trust.
[95] The fourth order, they understand the rest which they now enjoy, being gathered into their chambers and guarded by angels in profound quiet, and the glory which awaits them in the last days.
[96] The fifth order, they rejoice that they have now escaped what is corruptible, and shall inherit what is to come; and besides they see the straits and toil from which they have been delivered, and the spacious liberty which they are to receive and enjoy in immortality.
[97] The sixth order, when it is shown to them how their face is to shine like the sun, and how they are to be made like the light of the stars, being incorruptible from then on.
[98] The seventh order, which is greater than all that have been mentioned, because they shall rejoice with boldness, and shall be confident without confusion, and shall be glad without fear, for they hasten to behold the face of him whom they served in life and from whom they are to receive their reward when glorified.
[99] This is the order of the souls of the righteous, as henceforth is announced; and the aforesaid are the ways of torment which those who would not give heed shall suffer hereafter."
[100] I answered and said, "Will time therefore be given to the souls, after they have been separated from the bodies, to see what you have described to me?"
[101] He said to me, "They shall have freedom for seven days, so that during these seven days they may see the things of which you have been told, and afterwards they shall be gathered in their habitations."
, It was all Greek to me! 
