Numbers 9:6-13

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.