Numbers 9:1-10

1 And the Lord spoke to Moses in the wilderness of Sina in the second year after they had gone forth from the land of Egypt, in the first month, saying,
2 Speak, and let the children of Israel keep the passover in its season.
3 On 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.
4 And Moses ordered the children of Israel to sacrifice the passover,
5 on the fourteenth day of the first month in the wilderness of Sina, as the Lord appointed Moses, so the children of Israel did.
6 And 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.
7 And 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?
8 And Moses said to them, stand there, and I will hear what charge the Lord will give concerning you.
9 And the Lord spoke to Moses, saying,
10 Speak to the children of Israel, saying, Whatever man shall be unclean by reason of a dead body, or on a journey far off, among you, or among your posterity; he shall then keep the passover to the Lord,

Footnotes 1

The Brenton translation of the Septuagint is in the public domain.