Numbers 9:4-6

New Catholic Bible

⁴ So Moses told the people of Israel that they should observe the Passover. ⁵ They celebrated Passover on the sunset of the fourteenth day of the month in the Sinai Desert. The people of Israel did everything that the Lord had commanded Moses.

⁶ Now there were some men who had become unclean by touching a dead body, and they could not observe the Passover on that day. They came to Moses and Aaron on that day