'Feast of the Passover' in the Bible

Thou shalt not offer the blood of my sacrifice with leaven; neither shall the sacrifice of the feast of the passover be left unto the morning.

And they decreed that it should be proclaimed throughout all Israel from Beersheba to Dan, that they should come and hold the feast of the Passover unto the LORD God of Israel at Jerusalem: for they had not often done it, as it is written how they should.