Numbers 9:7

And those men said to him, We are unclean through touching a dead body . Why are we kept from bringing the Lord ’s offering at its appointed time among the people of Israel ?

and said to Moses, “We have become unclean because of a dead body, but why should we be kept from presenting the Lord`s offering with the other Israelites at the appointed time?”

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?