'Passover' in the Bible
“Now, let the sons of Israel observe the Passover at its appointed time.
They observed the Passover in the first month, on the fourteenth day of the month, at twilight, in the wilderness of Sinai; according to all that the Lord had commanded Moses, so the sons of Israel did.
But there were some men who were unclean because of the dead person, so that they could not observe Passover on that day; so they came before Moses and Aaron on that day.
“Speak to the sons of Israel, saying, ‘If any one of you or of your generations becomes unclean because of a dead person, or is on a distant journey, he may, however, observe the Passover to the Lord.
They shall leave none of it until morning, nor break a bone of it; according to all the statute of the Passover they shall observe it.
But the man who is clean and is not on a journey, and yet neglects to observe the Passover, that person shall then be cut off from his people, for he did not present the offering of the Lord at its appointed time. That man will bear his sin.
If an alien sojourns among you and observes the Passover to the Lord, according to the statute of the Passover and according to its ordinance, so he shall do; you shall have one statute, both for the alien and for the native of the land.’”
‘Then on the fourteenth day of the first month shall be the Lord’s Passover.
They journeyed from Rameses in the first month, on the fifteenth day of the first month; on the next day after the Passover the sons of Israel started out boldly in the sight of all the Egyptians,