'Unleavened Bread' in the Bible

It was now two days before the feast of the Passover and the unleavened bread: and the chief priests and the scribes made designs how they might take him by deceit and put him to death:

And on the first day of unleavened bread, when the Passover lamb is put to death, his disciples said to him, Where are we to go and make ready for you to take the Passover meal?