Numbers 9:1, 5
Numbers 9:1 AMP
The LORD spoke to Moses in the Wilderness of Sinai in the first month of the second year after they had come out of the land of Egypt, saying
Numbers 9:5 AMP
They observed the Passover on the fourteenth day of the first month at twilight in the Wilderness of Sinai; in accordance with all that the LORD had commanded Moses, so the Israelites did.


