Exodus 12:6 'You shall keep it until the fourteenth day of the same month, then the whole assembly of the congregation of Israel is to kill it at twilight.

Numbers 9:13 '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.

Numbers 9:14 '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.'" (NASB ©1995)