Passover is God’s feast which is made up of seven days, known as the 7 days of Unleavened bread:

Matthew 26:17

[Jesus Celebrates Passover with His Disciples] Now on the first day of the Feast of Unleavened Bread the disciples came to Jesus, saying to Him,

“Where do you want us to prepare for You to eat the Passover?

1 Corinthians 5: 6-8 = New International Version

Your boasting is not good. Do not you know that a little yeast leavens the whole batch of dough?

7 Get rid of the old yeast, so that you may be a new unleavened batch-as you really are.

For Christ, our Passover lamb, has been sacrificed.

8 Therefore let’s keep the festival, not with the old bread leavened with malice and wickedness, but with the unleavened bread of sincerity and truth.

Exodus 23:15

You’ll keep the Feast of  Unleavened Bread

 (You will eat unleavened bread seven days, as I commanded you, at the time appointed in the month of Abib, for in it you came out of Egypt; none shall appear before me empty);

Luke 22: 1-2 ( NKJV )

The Plot to Kill Jesus

22 Now the Feast of Unleavened Bread drew near, which is called Passover.

2 And the chief priests and the scribes sought how they might kill him, for they feared the people.

Jesus was killed and resurrected during those seven days of unleavened bread – being the celebration of Passover