Numbers 9:6-10

6And there were men, who were unclean through the dead body of a man, and could not hold the passover on that day; and they came before Moses and before Aaron on that day.

7And those men said to him, We are unclean by reason of the dead body of a man: why are we kept back, that we may not present the offering of Jehovah at its set time among the children of Israel?

8And Moses said to them, Stay, and I will hear what Jehovah commands concerning you.

9And Jehovah spoke to Moses, saying,

10Speak unto the children of Israel, saying, If any one of you or of your generations be unclean by reason of a dead body or be on a journey afar off, yet he shall hold the passover to Jehovah.