Numbers 9:1-14

The LORD spoke to Moses in the Wilderness of Sinai in the first month of the second year after they had come out of the land of Egypt, saying, “The sons of Israel are to keep the Passover at its appointed time. On the fourteenth day of this month at twilight, you shall keep it at its appointed time; according to all its statutes and ordinances you shall keep it.” So Moses told the Israelites to observe the Passover. They observed the Passover on the fourteenth day of the first month at twilight in the Wilderness of Sinai; in accordance with all that the LORD had commanded Moses, so the Israelites did. But there were certain men who were [ceremonially] unclean because of [touching] the dead body of a man, so they could not observe the Passover on that day; so they came before Moses and Aaron that same day. Those men said to Moses, “We are [ceremonially] unclean because of [touching] a dead body. Why are we being restrained from presenting the LORD’S offering at its appointed time among the Israelites?” Therefore, Moses said to them, “Wait, and I will listen to what the LORD will command concerning you.” Then the LORD spoke to Moses, saying, “Say to the Israelites, ‘If any one of you or of your descendants becomes [ceremonially] unclean because of [touching] a dead body or is on a distant journey, he may, however, observe the Passover to the LORD. On the fourteenth day of the second month [thirty days later] at twilight, they shall observe it; they shall eat it with unleavened bread and bitter herbs. They shall leave none of it until morning nor break any of its bones; in accordance with all the statutes of the Passover they shall observe it. [John 19:36] But the man who is [ceremonially] clean and is not on a journey, and yet does not observe the Passover, that person shall be cut off from among his people [excluding him from the atonement made for them] because he did not bring the LORD’S offering at its appointed time; that man will bear [the penalty of] his sin. If a stranger lives among you as a resident alien and observes the Passover to the LORD, in accordance with its statutes and its ordinances, so shall he do; you shall have one statute, both for the resident alien and for the native of the land.’ ”