The Lord spake unto Moses - The commands in this chapter appear to have been given at Succoth, on the same day in which they left Egypt.

And the Lord spake unto Moses,.... When he and the Israelites were at Succoth:
saying; as follows.

In remembrance of the destruction of the first-born of Egypt, both of man and of beast, and the deliverance of the Israelites out of bondage, the first-born males of the Israelites were set apart to the Lord. By this was set before them, that their lives were preserved through the ransom of the atonement, which in due time was to be made for sin. They were also to consider their lives, thus ransomed from death, as now to be consecrated to the service of God. The parents were not to look upon themselves as having any right in their first-born, till they solemnly presented them to God, and allowed his title to them. That which is, by special mercy, spared to us, should be applied to God's honour; at least, some grateful acknowledgment, in works of piety and charity, should be made. The remembrance of their coming out of Egypt must be kept up every year. The day of Christ's resurrection is to be remembered, for in it we were raised up with Christ out of death's house of bondage. The Scripture tells us not expressly what day of the year Christ rose, but it states particularly what day of the week it was; as the more valuable deliverance, it should be remembered weekly. The Israelites must keep the feast of unleavened bread. Under the gospel, we must not only remember Christ, but observe his holy supper. Do this in remembrance of him. Also care must be taken to teach children the knowledge of God. Here is an old law for catechising. It is of great use to acquaint children betimes with the histories of the Bible. And those who have God's law in their heart should have it in their mouth, and often speak of it, to affect themselves, and to teach others.

Sanctification of the first-born, and Promulgation of the Law for the Feast of Mazzoth. - Exodus 13:1, Exodus 13:2. The sanctification of the first-born was closely connected with the Passover. By this the deliverance of the Israelitish first-born was effected, and the object of this deliverance was their sanctification. Because Jehovah had delivered the first-born of Israel, they were to be sanctified to Him. If the Israelites completed their communion with Jehovah in the Passover, and celebrated the commencement of their divine standing in the feast of unleavened bread, they gave uninterrupted effect to their divine sonship in the sanctification of the first-born. For this reason, probably, the sanctification of the first-born was commanded by Jehovah at Succoth, immediately after the exodus, and contemporaneously with the institution of the seven days' feast of Mazzoth (cf. Exodus 2:15), so that the place assigned it in the historical record is the correct one; whereas the divine appointment of the feast of Mazzoth had been mentioned before (Exodus 12:15.), and the communication of that appointment to the people was all that remained to be mentioned here.