Moses
Exodus 12:3BSB·traditional attribution

Tell the whole congregation of Israel that on the tenth day of this month each man must select a lamb for his family, one per household.

John Calvin Reformed @genevareformer

3. Speak ye unto all. A question is asked on this passage, why, when one Lamb alone was offered in sacrifice for the reconciliation of the Church, and God was propitiated by the blood of one Christ alone, He should have commanded a lamb to be slain in every house, as if there were to be a special sacrifice for every one apart?

Matthew Henry Presbyterian @wholebiblehenry

Moses and Aaron here receive of the Lord what they were afterwards to deliver to the people concerning the ordinance of the passover, to which is prefixed an order for a new style to be observed in their months (Exo 12:1, Exo 12:2): This shall be to you the beginning of months.

Commenting on Exodus 12:1-20

John Gill Reformed Baptist @doctorgill

Speak ye unto all the congregation of Israel,.... That is, to the elders of the people, and heads of families; unless we can suppose that they had been gradually gathered, and were now gathered together in a body by the direction of Moses, by whom they were assured that their departure was at hand; and the rather it may be thought that so it was...