Numbers 9:7
and those men said to him, We are unclean by reason of the dead body of a man. Why are we kept back, that we may not offer the oblation of LORD in its appointed season among the sons of Israel?
Exodus 12:27
that ye shall say, It is the sacrifice of LORD's Passover, who passed over the houses of the sons of Israel in Egypt, when he smote the Egyptians, and delivered our houses. And the people bowed the head and worshipped.
Numbers 9:2
Moreover let the sons of Israel keep the Passover in its appointed season.
Deuteronomy 16:2
And thou shall sacrifice the Passover to LORD thy God, of the flock and the herd, in the place which LORD shall choose to cause his name to dwell there.
2 Chronicles 30:17-19
For there were many in the assembly who had not sanctified themselves. Therefore the Levites had charge of killing the Passovers for everyone who was not clean, to sanctify them to LORD.
1 Corinthians 5:7-8
Purge out the old leaven, so that ye may be a new lump, since ye are unleavened. For also Christ our Passover was sacrificed for us.