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John Gill
And teach customs,.... The Vulgate Latin and Ethiopic versions read in the singular number, "custom or law"; referring to the doctrine of salvation by Christ, in whose name the spirit of divination was cast out of the maid, and whom they took for a new deity; and so concluded that the apostle and his company were introducing a new religious law or custom, the worship of another God: which are not...
Matthew Henry
It is some rebuke to Barnabas that after he left Paul we hear no more of him, of what he did or suffered for Christ. But Paul, as he was recommended by the brethren to the grace of God, so his services for Christ after this are largely recorded; we are to attend him in this chapter from place to place, wherever he came doing good, either watering or planting, beginning new work or improving what...
Charles H. Spurgeon
Saying, These men, being Jews, do exceedingly trouble our city, and teach customs, which are not lawful for us to receive, neither to observe, being Romans. They did not know that Paul himself was a Roman citizen, or they surely would not have brought such a charge as that against him.