'Unleavened Bread' in the Bible

And seeing that it pleased the Jews, he proceeded to apprehend Peter also,??nd it was during the days of unleavened bread,??4 and having seized he put him in prison, committing him to four companies of four soldiers each to guard him, wishing after the passover to bring him before the people.

And we sailed from Philippi, after the days of unleavened bread, and came to those at Troas in five days, where we staid seven days.