And ye shall observe this thing for an ordinance to thee and to thy sons for ever.
24. And ye shall observe this thing. He again repeats the precept as to its annual celebration, and expressly says, that, when they have come into the land, the recollection of their deliverance is yearly to be revived by this rite.
Moses faithfully taught the elders all God had commanded him. The people must not stir out of doors that night, staying under the protection of the blood; their safety hangs on the sprinkled mark, not on their own wisdom or strength. Later they must teach their children what this service means.
AI summary
Commenting on Exodus 12:21-28
And ye shall observe this thing for an ordinance to thee and thy sons for ever. Not this last thing of sprinkling the blood, which was peculiar to the passover in Egypt; but the whole before observed relating to the feast of the passover, and the feast of unleavened bread, and all the rites appertaining to them, which were to be observed until the coming of Christ.