Can you point out anywhere in the NT where we are instructed to keep the feasts of the OT or where Jesus or the Deciples kept the feasts of the OT after Jesus was reserected? I see no example or instruyction to do so. I do see where we are warned about people who try to draw us back under the law, which OT feasts are tied to.
So, you were wondering where in the NT we even see these festivals after Jesus rose from the dead. Well…
In Acts 2 we see the followers of Jesus meeting in the Temple to celebrate the feast of Pentecost (which is the Biblical Holy Day Shavuot as appointed in in Leviticus 23:15-22, Exodus 34:22; Numbers 28:26-31; Deuteronomy 16:9, 10)
1 And when the day of Pentecost was fully come, they were all with one accord in one place. 2 And suddenly there came a sound from heaven as of a rushing mighty wind, and it filled all the house where they were sitting. 3 And there appeared unto them cloven tongues like as of fire, and it sat upon each of them. 4 And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance.
So that’s the first biblical feast observed after Jesus ascended to Heaven.
Acts 27:9 mentions Yom Kippur/Day of Atonement which is a holy day of fasting (actually, it’s the only fast appointed by God and was always observed by faithful Jews)
27:9Now when much time was spent, and when sailing was now dangerous, because the fast F51 was now already past, Paul admonished them…
That footnote points to this note:
F51: the fast: the fast was on the tenth day of the seventh month
And this proves that it was Yom Kippur because Adonai told His people:
Le 23:27 – Also on the tenth day of this seventh month there shall be a day of atonement: it shall be an holy convocation unto you; and ye shall afflict your souls, and offer an offering made by fire unto the LORD.
And we see Paul in Acts 18
18:21…But bade them farewell, saying, I must by all means keep this feast that cometh in Jerusalem: but I will return again unto you, if God will. And he sailed from Ephesus.
There are certain feasts / holy days that require that if you can, you observe in Jerusalem. Those feasts are called the pilgrimage festivals and they are:
So Paul was observing one of these festivals.
Hope that helped answer your question!
Be blessed, everyone.