Numbers 9:9

There were certain men who were unclean because of the dead body of a man, so that they could not keep the Passover on that day, and they came before Moses and Aaron on that day.

Those men said to him, “We are unclean because of the dead body of a man. Why are we kept back, that we may not offer the offering of the LORD in its appointed season among the children of Israel?”

Moses answered them, “Wait, that I may hear what the LORD will command concerning you.”

“Say to the children of Israel, ‘If any man of you or of your generations is unclean by reason of a dead body, or is on a journey far away, he shall still keep the Passover to the LORD.

In the second month, on the fourteenth day at evening they shall keep it; they shall eat it with unleavened bread and bitter herbs.

They shall leave none of it until the morning, nor break a bone of it. According to all the statute of the Passover they shall keep it.