And the children of Israel went away,.... The elders of the people, Exodus 12:21 they departed to their several tribes and families at Goshen and elsewhere:

and did as the Lord commanded Moses and Aaron, so did they; they took a lamb on the tenth day, and kept it till the fourteenth, on which day they slew it, and roasted it with fire, and ate it with unleavened bread and bitter herbs.

They then proceeded to execute the command, that through the obedience of faith they might appropriate the blessing of this "service."

And the children of Israel went away, and did as the LORD had commanded Moses and Aaron, so did they.

12:21-28 That night, when the first-born were to be destroyed, no Israelite must stir out of doors till called to march out of Egypt. Their safety was owing to the blood of sprinkling. If they put themselves from under the protection of that, it was at their peril. They must stay within, to wait for the salvation of the Lord; it is good to do so. In after-times they should carefully teach their children the meaning of this service. It is good for children to ask about the things of God; they that ask for the way will find it. The keeping of this solemnity every year was, 1. To look backward, that they might remember what great things God had done for them and their fathers. Old mercies, to ourselves, or to our fathers, must not be forgotten, that God may be praised, and our faith in him encouraged. 2. It was designed to look forward, as an earnest of the great sacrifice of the Lamb of God in the fulness of time. Christ our passover was sacrificed for us; his death was our life.