Numbers 9:6-8

6 ¶ And there were certain men, who were defiled by the dead body of a man, that they could not keep the passover on that day: and they came before Moses and before Aaron on that day: 7 And those men said unto him, We are defiled by the dead body of a man: wherefore are we kept back, that we may not offer an offering of the Lord in his appointed season among the children of Israel? 8 And Moses said unto them, Stand still, and I will hear what the Lord will command concerning you.