Exodus 12:27

It is the sacrifice of the Lord’s passover - or This is the sacrifice of the Passover to Yahweh. The most formal and exact designation of the festival is thus given: but “the Passover” may mean either the act of God’s mercy in sparing the Israelites, or the lamb which is offered in sacrifice: more probably the latter, as in Exodus 12:21. This gives a clear sense to the expression “to Yahweh;” the Passover lamb was a sacrifice offered to Yahweh by His ordinance.