Numbers 9:6-12

6However, there were some men who could not celebrate Passover because of being defiled by a dead body. So they came to Moses and Aaron on that same day,

7and these men said to him, “We have become unclean because of a dead man’s body. Why should we be kept from presenting the offering of Adonai at the appointed time with the rest of Bnei-Yisrael?”

8Moses answered them, “Wait, and I will inquire what Adonai commands concerning you.”

9Then Adonai spoke to Moses saying,

10“Say to Bnei-Yisrael saying: If any man, whether you or your descendants, becomes unclean because of a dead body, or is away on a long journey, he may yet observe Adonai’s Passover.

11They are to celebrate it at twilight on the fourteenth day of the second month. With matzot and bitter herbs they are to eat it.

12They are not to leave any of it until morning, or break any bones. When they celebrate Passover they are to observe all its regulations.