It's all been posted several times before--but in Hebrews it is obvious that all rituals involving animal sacrifes were no longer applicable, they are old covenant--new covenant is Christ is the Sacrificial Lamb and also our High Priest (after the order of Mechizedek) Christ's priesthood is not of the Aaronic line, but of Melchizedek--the Aaronic priesthood were of mortal man, they died requiring many priests--the order of Melchizedek is of Divine, immortal appointment
(Gen 14:18) And Melchizedek king of Salem brought forth bread and wine: and he was the priest of the most high God.
(Psa 110:4) The LORD hath sworn, and will not repent, Thou art a priest for ever after the order of Melchizedek.
(Heb 7:1) For this Melchisedec, king of Salem, priest of the most high God, who met Abraham returning from the slaughter of the kings, and blessed him;
(Heb 7:2) To whom also Abraham gave a tenth part of all; first being by interpretation King of righteousness, and after that also King of Salem, which is, King of peace;
(Heb 7:3) Without father, without mother, without descent, having neither beginning of days, nor end of life; but made like unto the Son of God; abideth a priest continually.
To offer animal sacrifices after the cross is contrary to scripture--it denies Christs sacrifice. There were also other sacrifices that could be offered instead of an animal , and even those, then, were no longer needed.
As for the feast days--Pentecost was called the Feast of Weeks-celebrated fifty days after the Passover in memory of Moses receiving the laws on Mt. Sinai 50 days after leaving Egypt. That required bread offerings along with 7 lambs, 1 bullock, 2 rams...It's in Lev 23:15-22.
The disciples received the Holy Spirit on the day Pentecost, they were gathered together in one place, it doesn't state what day of the week it was. The sound of a mighty wind filled all the HOUSE--hardly a place in which to offer up all those animals. The day of Pentecost filled the city of Jerusalem with Jews from every nation--and when they heard about the disciples speaking in their own language "the multitude came together."--Perfect time and place to demonstrate the power of God.It does not state they were "keeping" that feast day, just that they were gathered together on that day at a house--not the temple. Bob Ryan also addressed this day.
Acts 20:16--Paul was hurrying to be at Jerusalem, if possible, on the day of Pentecost.--Paul liked to preach to to large gatherings--and even though he hasted to get to Jerusalem for the day of Pentecost, however, Acts 21:4 "And finding disciples, we tarried there seven days:who said to Paul through the Spirit, that he should not go up to Jerusalem."---No mention that the Day of Pentecost was "kept" while at Tyre.
Passover and unleavened bread was discussed by Bob--And just a note--Passover (now called Communion) was celebrated without leavening--of any kind--which means that the "wine" could not be fermented--no yeast anywhere permitted.
Feast of Tabernacles: Acts 18--Paul spent 1 yr and 6 mths in Corinth and then he went to Syria with Priscilla and Aquila then he went to Ephesus and "reasoned with the Jews." They wanted him to stay longer, he said no no as he had to "keep this feast that cometh in Jerusalem"--What feast??---it doesn't say. All his travels were documented for over 1 1/2 years and no mention of him keeping any feast, and no way to determine what feast he was trying to get to in Jerusalem or when that feast would be as he then went to Caesarea, Antioch (where he spent some time) then on to "all the country of Galatia and Phrygia in order, strengthening the disciples." And he keeps on going and in Acts 19 :10 it says this went on for 2 more years so all of Asia heard of Jesus--And still no mention of what feast he had wanted to be in Jerusalem for or that he made it there!
Acts 27:9--"the fast was now already passed."--That is the Day of Atonement--Yom Kipper--That day required animal sacrifices also--High priest went into the holy place with a bullock and ram- and 2 goats and a ram. The 2 goats were for the sins of the congregation--one goat was killed for the sins of the congregation, lots of blood going around to cleans the sins of the congregation, the sins of the high priest and to cleanse the sanctuary,n and then the priest laid his hands on the live goat and confessed all the sins of Israel putting them on the head of the goat and the goat was led out into the wilderness and let go. It was the highest of Holy Days, depicting the price that Jesus would pay to cleans us from sins and depicting the end of Satan--the goat who took the blame for the price of all those sins that Christ had to die for--the wilderness--the 1000 years when Satan is bound.
Now, all that Acts 27:9 says is that the day of atonement had already passed, placing this event (the voyage) in the winter-a time not suitable for the voyage and Paul warned that it would now be a voyage that would be very dangerous for cargo and ship and also for their lives, but nobody listened to him and they took off anyway--which proved as disasterous as Paul had predicted.