And I am sure that the king of Egypt will not let you go, no, not by a mighty hand.
All Commentaries on Exodus 3:19 Go To Exodus 3
Augustine of Hippo
Accordingly on the one hand the Egyptians deserved being deceived, and on the other the people of Israel were then situated at such a level of morality, because of the age of the human race, that it would not be unworthy of them to deceive an enemy. It therefore came about that God commanded them (or, rather, permitted them because of their desire) to ask of the Egyptians gold and silver implements which these seekers of a kingdom as yet earthly were gazing upon longingly, even though they were not going to return them, and to take them as if they were going to return them. God did not want to be unjust in the matter of the reward for such lengthy hardship and labor—a reward adapted to the level of such souls; nor did he want to be unjust in the matter of the punishments of the Egyptians, whom appropriately enough he caused to lose what they were under obligation to pay. And so God is not a deceiver.