Acts 7:6

See, what a number of years the Promise has been given, and the manner of the Promise, and nowhere sacrifice, nowhere circumcision! He here shows, how God Himself suffered them to be afflicted, not that He had anything to lay to their charge. "And they shall bring them into bondage," etc. But nevertheless, they did not these things with impunity. "And the nation to whom they shall be in bondage I will judge, said God." For, to show that they are not to go by this, in estimating who are pious (by reason of their saying, "He trusted in God, let Him deliver Him")--He, the Same that promised, He that gave the land, first permits the evils. So also now, though He has promised a Kingdom, yet He suffers us to be exercised in temptations. If here the freedom was not to be till after four hundred years, what wonder, with regard to the Kingdom? Yet he performed it, and lapse of time availed not to falsify His word. Moreover, it was no ordinary bondage they underwent. And the matter does not terminate solely in the punishment of those (their oppressors); but they themselves also, He saith, shall enjoy a mighty salvation. Here he reminds them too of the benefit which they enjoyed.

This is suitable to be said here also: that God is rich in ways and means to bring us up from hence. For this above all showed the riches of God's resources, that in its very reverses the nation increased, while enslaved, while evil-entreated, and sought to be exterminated. And this is the greatness of the Promise. For had it increased in its own land, it had not been so wonderful. And besides, it was not for a short time, either, that they were in the strange land: but for four hundred years. Hence we learn a great lesson of philosophic endurance: they did not treat them as masters use slaves, but as enemies and tyrants--and he foretold that they should be set in great liberty: for this is the meaning of that expression, "They shall serve Me: and they shall come up hither again"; and with impunity.