Numbers 9:5

³On the fourteenth day of the first month at even, thou shalt keep it in its season; thou shalt keep it according to its law, and according to its ordinance.

⁴And Moses ordered the children of Israel to sacrifice the Passover,

— Numbers 9:5 —

⁶And there came men who were unclean by reason of a dead body, and they were not able to keep the Passover on that day; and they came before Moses and Aaron on that day.

⁷And those men said to Moses, We are unclean by reason of the dead body of a man: shall we therefore fail to offer the gift to the Lord in its season in the midst of the children of Israel?