Numbers 9
2 Ref "Moreover let the children of Israel keep the Passover in its appointed season.
3 Ref On the fourteenth day of this month, at evening, you shall keep it in its appointed season-- according to all its statutes, and according to all its ordinances, you shall keep it."
4 Moses spoke to the children of Israel, that they should keep the Passover.
5 Ref They kept the Passover in the first month, on the fourteenth day of the month, at evening, in the wilderness of Sinai. According to all that Yahweh commanded Moses, so the children of Israel did.
6 Ref There were certain men, who were unclean because of the dead body of a man, so that they could not keep the Passover on that day, and they came before Moses and before Aaron on that day.
7 Ref Those men said to him, "We are unclean because of the dead body of a man. Why are we kept back, that we may not offer the offering of Yahweh in its appointed season among the children of Israel?"