Mark 14:12
Now on the first day of the Festival of Unleavened Bread [i.e., the beginning of the Passover Festival week], when they sacrificed the Passover [lamb], Jesus' disciples said to Him, "Where do you want us to go to make preparations for you to eat the Passover meal?"
Luke 22:7
Then the day came for the Festival of Unleavened Bread [to be held], on which the Passover [lamb] was to be sacrificed.
1 Corinthians 5:7-8
Get rid of the old yeast [i.e., of sin, and especially the unrepentant sinner], so that you can be a new batch of dough, without yeast in it [i.e., a godly church without unrepentant sinners in it] as [I know] you really are. For our Passover [Lamb], Christ, has already been sacrificed.