Numbers 9:3-5

CAB(i) 3 On the fourteenth day of the first month at evening, you shall keep it in its season; you shall 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 Sinai, as the Lord appointed Moses, so the children of Israel did.