And I will harden the hearts of the Egyptians so that they will go in after them. Then I will gain honor by means of Pharaoh and all his army and chariots and horsemen.
- Exodus 14:17
do not harden your hearts as you did at Meribah, in the day at Massah in the wilderness,
- Psalm 95:8
As it has been said: “Today, if you hear His voice, do not harden your hearts, as you did in the rebellion.”
- Hebrews 3:15
God again designated a certain day as “Today,” when a long time later He spoke through David as was just stated: “Today, if you hear His voice, do not harden your hearts.”
- Hebrews 4:7
All that God had to do to harden Pharaoh's heart, or to harden your heart, is to withhold His own grace.