Esodo 10:1

And the LORD said unto Moses, Go in unto Pharaoh: for I have hardened his heart, and the heart of his servants, that I might shew these my signs before him:

Ver. 1. For I have hardened his heart.] As he that brings in a light blinds an owl; or as he that pours on water kindles the lime whereupon it is poured: so the Lord by publishing his commands, and by doing his miracles, hardened the heart of Pharaoh; who, for his wilful rebellion, was justly forsaken of God, and delivered up to his own heart which is somewhat worse than to be delivered up to the devil.