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Keeping the feasts and the Sabbath is what every believer in Acts was doing.
It was detailed as essential by Yeshua himself in two chapters in Matthew, and expressly in detail by John in his first epistle, and by Paul in Romans 2.
And Acts tells the story of Christianity being embraced by other than Jews. That's what the whole of that letter is about. — why do you add more than what the Holy Spirit set forth?
It was detailed as essential by Yeshua himself in two chapters in Matthew, and expressly in detail by John in his first epistle, and by Paul in Romans 2.
Mark 2:27,28 Then he said to them, "The Sabbath was made for man, not man for the Sabbath. So the Son of Man is Lord even of the Sabbath." I trust the Holy Spirit is in agreement with the Lord of the Sabbath in this matter, and seeing as how they said For it has seemed good to the Holy Spirit and to us to impose on you no further burden than these essentials: that you abstain from what has been sacrificed to idols and from blood and from what is strangled and from fornication they would have included the Sabbath as essential if it were.
Earlier in Acts chapter 15 it details how the matter got brought up to the council:
When they came to Jerusalem, they were welcomed by the church and the apostles and the elders, and they reported all that God had done with them. But some believers who belonged to the sect of the Pharisees stood up and said, “It is necessary for them to be circumcised and ordered to keep the law of Moses.”The apostles and the elders met together to consider this matter.
After there had been much debate, Peter stood up and said to them, “My brothers, you know that in the early days God made a choice among you, that I should be the one through whom the Gentiles would hear the message of the good news and become believers. And God, who knows the human heart, testified to them by giving them the Holy Spirit, just as he did to us; and in cleansing their hearts by faith he has made no distinction between them and us. Now therefore why are you putting God to the test by placing on the neck of the disciples a yoke that neither our ancestors nor we have been able to bear? On the contrary, we believe that we will be saved through the grace of the Lord Jesus, just as they will.”
The whole assembly kept silence, and listened to Barnabas and Paul as they told of all the signs and wonders that God had done through them among the Gentiles.