Numbers 9:6-13

Now there were certain men who were defiled by a human corpse, so that they could not keep the Passover on that day; and they came before Moses and Aaron that day. And those men said to him, “We became defiled by a human corpse. Why are we kept from presenting the offering of the LORD at its appointed time among the children of Israel?” And Moses said to them, “Stand still, that I may hear what the LORD will command concerning you.” Then the LORD spoke to Moses, saying, “Speak to the children of Israel, saying: ‘If anyone of you or your posterity is unclean because of a corpse, or is far away on a journey, he may still keep the LORD’s Passover. On the fourteenth day of the second month, at twilight, they may keep it. They shall eat it with unleavened bread and bitter herbs. They shall leave none of it until morning, nor break one of its bones. According to all the ordinances of the Passover they shall keep it. But the man who is clean and is not on a journey, and ceases to keep the Passover, that same person shall be cut off from among his people, because he did not bring the offering of the LORD at its appointed time; that man shall bear his sin.