Paul did also many other things that were Jewish and ceremonial, for which he had, as then, no conscience at all, as to any sanction that he believed was in them.
As his circumcising of Timothy (Acts 16:1-3).
His shaving of his head (Acts 18:18).
His submitting to Jewish purifications (Acts 21:24-26).
His acknowledging of himself a Pharisee (chap. 23:6).
His implicitly owning of Ananias for high priest after Christ was risen from the dead (Acts 23:1-5).
He tells us also that, 'unto the Jews he became as a Jew' that he might save the Jew. And 'without law,' to them that were without law, that also he might gain them. Yea, he became, as he saith, 'all things to all men,' that he might gain the more, as it is 1 Corinthians 9:19-23.
But these things, as I said, he did not of conscience to the things; for he knew that their sanction was gone. Nor would he suffer them to be imposed upon the churches directly or indirectly; no, not by Peter himself (Gal 2:11).
Were I in Turkey with a church of Jesus Christ, I would keep the first day of the week to God, and for the edification of his people: and would also preach the word to the infidels on their sabbath day, which is our Friday; and be glad too, if I might have such opportunity to try to persuade them to a love of their own salvation.
Obj. But if the seventh day sabbath is, as you say, to be laid aside by the churches of the Gentiles, why doth Christ say to his, 'Pray ye that your flight be not in the winter, neither on the sabbath day?' For, say some, by this saying it appears, that the old seventh day sabbath, as you have called it, will as to the sanction of it, abide in force after Christ is ascended into heaven.