Numbers 9:3
“In the fourteenth day of this month, at even, ye shall keep it in his appointed season: according to all the rites of it, and according to all the ceremonies thereof, shall ye keep it.”
And the Lord spake unto Moses in the wilderness of Sinai, in the first month of the second year after they were come out of the land of Egypt, saying,
Let the children of Israel also keep the passover at his appointed season.
In the fourteenth day of this month, at even, ye shall keep it in his appointed season: according to all the rites of it, and according to all the ceremonies thereof, shall ye keep it.
And Moses spake unto the children of Israel, that they should keep the passover.
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.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“The fourteenth day of the second month at even they shall keep it, and eat it with unleavened bread and bitter herbs.”
“In the fourteenth day of the first month at even is the Lord’s passover.”
“For the king had taken counsel, and his princes, and all the congregation in Jerusalem, to keep the passover in the second month.”
“For then must he often have suffered since the foundation of the world: but now once in the end of the world hath he appeared to put away sin by the sacrifice of himself.”
“Then they killed the passover on the fourteenth day of the second month: and the priests and the Levites were ashamed, and sanctified themselves, and brought in the burnt offerings into the house of the Lord.”