'Unleavened' in the Bible

Now on the first day of unleavened bread the disciples came to Jesus, saying, Where are we to make ready for you to take the Passover meal?

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?

Now the feast of unleavened bread was near, which is called the Passover.

And the day of unleavened bread came, when the Passover lamb is put to death.

And when he saw that this was pleasing to the Jews he went on to take Peter in addition. This was at the time of the feast of unleavened bread.

And we went away from Philippi by ship after the days of unleavened bread, and came to them at Troas in five days; and we were there for seven days.

Let us then keep the feast, not with old leaven, and not with the leaven of evil thoughts and acts, but with the unleavened bread of true thoughts and right feelings.