It was a night of watching by the LORD, to bring them out of the land of Egypt; so this same night is a night of watching kept to the LORD by all the people of Israel throughout their generations.
42. It is a night to be much observed. He shows that the Israelites have good cause for sacrificing to God with a solemn ceremony year by year for ever, and for celebrating the memory of that night; and that the Passover was instituted in token of their gratitude.
They departed at once without delay, knowing Pharaoh's mind would not hold. From seventy souls in two centuries arose this vast multitude, a blessing from God commanding fruitfulness. The mixed rabble who followed, however, proved a snare to them and likely abandoned Israel when they learned of forty years in the wilderness.
AI summary
Commenting on Exodus 12:37-42
But every man's servant that is bought for money,.... And so his own property: when thou hast circumcised him; as such an one ought to be, according to the covenant of circumcision given to Abraham, Gen 17:13, though one should think not without his consent; wherefore care was to be taken to purchase such servants as would be willing to conform to that rite, and...