Numbers 9:5 in the King James Version
And they kept the passover on the fourteenth day of the first month at even in the wilderness of Sinai: according to all that the LORD commanded Moses, so did the children of Israel.
Context
4 Moses told the children of Israel that they should keep the Passover.
5 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 the LORD commanded Moses, so the children of Israel did.
6 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 Aaron on that day.