Numbers 9:2-7

MLV(i) 2 Moreover let the sons of Israel keep the Passover in its appointed season. 3 In the fourteenth day of this month, at evening, you* will keep it in its appointed season. According to all the statutes of it and according to all the ordinances of it, you* will keep it. 4 And Moses spoke to the sons of Israel, that they should keep the Passover. 5 And 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 Jehovah commanded Moses, so did the sons of Israel.
6 And there were certain men who were unclean by reason 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 and those men said to him, We are unclean by reason of the dead body of a man. Why are we kept back, that we may not offer the oblation of Jehovah in its appointed season among the sons of Israel?