Grace is a gift from God that covers many sins that a person misses repenting, things like what these reference:
M't:5:28:
But I say unto you,
That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart.
Jas:2:10-11:
For whosoever shall keep the whole law,
and yet offend in one point,
he is guilty of all.
For he that said,
Do not commit adultery,
said also,
Do not kill.
Now if thou commit no adultery,
yet if thou kill,
thou art become a transgressor of the law.
The above applies to thoughts if you are a Gentile, it is referencing the 10 Commandments only.
Christian have to repent sinful thoughts as well as sinful deeds. OT only believers have to repent nothing as their resurrection is based on their family tree:
Eze:37:11-17:
Then he said unto me,
Son of man,
these bones are the whole house of Israel:
behold,
they say,
Our bones are dried,
and our hope is lost:
we are cut off for our parts.
Therefore prophesy and say unto them,
Thus saith the Lord GOD;
Behold,
O my people,
I will open your graves,
and cause you to come up out of your graves,
and bring you into the land of Israel.
And ye shall know that I am the LORD,
when I have opened your graves,
O my people,
and brought you up out of your graves,
And shall put my spirit in you,
and ye shall live,
and I shall place you in your own land:
then shall ye know that I the LORD have spoken it,
and performed it, saith the LORD.
The word of the LORD came again unto me,
saying,
Moreover,
thou son of man,
take thee one stick,
and write upon it,
For Judah,
and for the children of Israel his companions:
then take another stick,
and write upon it,
For Joseph,
the stick of Ephraim,
and for all the house of Israel his companions:
And join them one to another into one stick;
and they shall become one in thine hand.
This part is about the different emotions both groups experience, based on sinful thoughts being allowed or not. Feeding the poor and taking revenge or stealing something create completely different emotions. Jews feel the good emotions when helping others, that is other Jews as Gentiles are viewed as 'the land of the enemy'. God puts death as being the land of the enemy. That point is also lost so the meaning of OT prophecies is changed
Heb:8:7:
For if that first covenant had been faultless,
then should no place have been sought for the second.
Jer:31:31-33:
Behold,
the days come,
saith the LORD,
that I will make a new covenant with the house of Israel,
and with the house of Judah:
Not according to the covenant that I made with their fathers in the day that I took them by the hand to bring them out of the land of Egypt;
which my covenant they brake,
although I was an husband unto them,
saith the LORD:
But this shall be the covenant that I will make with the house of Israel;
After those days,
saith the LORD,
I will put my law in their inward parts,
and write it in their hearts;
and will be their God,
and they shall be my people.
M't:2:16-18:
Then Herod,
when he saw that he was mocked of the wise men,
was exceeding wroth,
and sent forth,
and slew all the children that were in Bethlehem,
and in all the coasts thereof,
from two years old and under,
according to the time which he had diligently enquired of the wise men.
Then was fulfilled that which was spoken by Jeremy the prophet,
saying,
In Rama was there a voice heard,
lamentation,
and weeping,
and great mourning,
Rachel weeping for her children,
and would not be comforted,
because they are not.
Jer:31:15-17:
Thus saith the LORD;
A voice was heard in Ramah,
lamentation,
and bitter weeping;
Rahel weeping for her children refused to be comforted for her children,
because they were not.
Thus saith the LORD;
Refrain thy voice from weeping,
and thine eyes from tears:
for thy work shall be rewarded,
saith the LORD;
and they shall come again from the land of the enemy.
And there is hope in thine end,
saith the LORD,
that thy children shall come again to their own border.
The above is showing the Eze:37 resurrections are a literal event, the second covenant God makes with 'the whole House of Israel' is made with people like Jesus was when He was resurrected. That includes being able to appear in a room with a locked door and no windows. The mortal body God viewed as 'flawed' in Isaiah:53 was replaced by the one He had in the 40 days after His resurrection. It is the immortal body that will be walking to the living water and tree of life as defined in Eze:47. The 'house' is referencing the Temple Christ will build and then it is decorated by the people over the next 1,000 years.
Satan's last view is his capital city being melted like Sodom was will be replaced by what the city and land around it would have been like if sin had never entered the world. The Throne from the Re:4 Temple (represents the Holy Spirit from Ge:1:2), the water is from God in Ge:1:1.
The people alive at the end of the same day the two witnesses are resurrected are not given in marriage, they never have children.
During the 1,000 years, Israel plays the older brother who is in front of Jesus and the 24 Elders 24/7 minus the 30 days when the Gentile Church comes for a sinless version of Passover. Israel makes the red wine and the Church brings the ripe barley for the bread. What they are being shown is how a shepherd/flock relationship with 'strangers' is how immortal people can experience 'the joys of parenthood' without having actual children like the 100 each married couple in the flock will have.
These two group become a single group in the new earth. They can never fall into sin as they never leave the city. Children come to them when they are 120 years. When they eat from one tree, the other tree is also ready to be eaten from before the mortal person 'dies'. Repeat the same pattern for the next 40B years. Then the people in the city will be as wise as the angels in their perfected heaven in Hebrews:12, aka Mount Sion.
They are sinless immortals by the time all sinful immortals are in the fiery lake, they can enter new Jerusalem as soon as they get there. The rest of Adam and Eve's children enter after going through judgment by God. They are as innocent as the people alive at the end of day1 of the 1,000 years will be. The trip from heaven to the new earth means the people in the city first will have 2 days of wisdom about God to pass on when they first meet.
It will be like Adam explained to Eve how the garden came into being, Adam was the witness to the literal events because he was the first creation on day 6 in the garden, Eve only saw it through the stories her husband to her because she was the last creation on that day.