Acts 20:6

From Philippi; where they embarked, and sailed on the river first, then on the sea. After the days of unleavened bread; though St. Paul would not have the Gentile converts to be burdened with the ceremonial law, yet, that he might not offend the Jews, for a while he complied with their rites, Acts 18:21, they being indeed dead, but not yet deadly; and therefore he stays his journey all the time of the passover solemnity, instructing them in the mean while of the nature and use of such things.