Exodus 10:1 - Joseph Benson’s Commentary on the Old and New Testaments

Go unto Pharaoh: for I have hardened his heart That is, either, 1st, Go and make a new address unto him, for what I have yet done has but hardened his heart: or, 2d, כי, here translated for, must, as is often the case, be rendered although; go and speak to him again, although I have suffered his heart to be hardened, and to continue obdurate, that I might more fully display my power and providence, not only to Egypt and the adjacent countries, but to generations yet unborn, and especially to the posterity of my people Israel; that thou mayest tell (Exo 10:2) in the ears of thy son, and thy son's son, what things I have wrought. These plagues are standing monuments of the greatness of God, the happiness of the church, and the sinfulness of sin; and standing monitors to the children of men in all ages, not to provoke the Lord to jealousy, nor to strive with their Maker. The benefit of these instructions to the world doth sufficiently balance the expense.