'Unleavened' in the Bible

Now on the first day of unleavened bread the disciples came to Jesus, saying, Where wilt thou that we make ready for thee to eat the passover?

Now after two days was the feast of the passover and the unleavened bread: and the chief priests and the scribes sought how they might take him with subtlety, and kill him:

And on the first day of unleavened bread, when they sacrificed the passover, his disciples say unto him, Where wilt thou that we go and make ready that thou mayest eat the passover?

Now the feast of unleavened bread drew nigh, which is called the Passover.

And the day of unleavened bread came, on which the passover must be sacrificed.

And when he saw that it pleased the Jews, he proceeded to seize Peter also. And those were the days of unleavened bread.

And we sailed away from Philippi after the days of unleavened bread, and came unto them to Troas in five days, where we tarried seven days.

Purge out the old leaven, that ye may be a new lump, even as ye are unleavened. For our passover also hath been sacrificed, even Christ:

wherefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness, but with the unleavened bread of sincerity and truth.