'Unleavened Bread' in the Bible

Within two days was the feast of the passover, and of unleavened bread. and the chief priests, with the Scribes, contriv'd how they might seize Jesus by surprize, and put him to death.

On the first day of unleavened bread, when the paschal lamb is kill'd, his disciples said to him, where would you have us go and prepare for your eating the paschal lamb?