20 But Yahweh hardened Pharaoh’s heart, and he didn’t let the children of Israel go.
Exodus 10:20 Cross References - WEB
Exodus 4:21
21 Yahweh said to Moses, “When you go back into Egypt, see that you do before Pharaoh all the wonders which I have put in your hand, but I will harden his heart and he will not let the people go.
Exodus 7:13-14
Exodus 9:12
12 Yahweh hardened the heart of Pharaoh, and he didn’t listen to them, as Yahweh had spoken to Moses.
Exodus 11:10
10 Moses and Aaron did all these wonders before Pharaoh, but Yahweh hardened Pharaoh’s heart, and he didn’t let the children of Israel go out of his land.
Deuteronomy 2:30
30 But Sihon king of Heshbon would not let us pass by him; for Yahweh your God hardened his spirit and made his heart obstinate, that he might deliver him into your hand, as it is today.
Isaiah 6:9-10
9 He said, “Go, and tell this people, ‘You hear indeed, but don’t understand. You see indeed, but don’t perceive.’
10 Make the heart of this people fat. Make their ears heavy, and shut their eyes; lest they see with their eyes, hear with their ears, understand with their heart, and turn again, and be healed.”
John 12:39-40
Romans 9:18
18 So then, he has mercy on whom he desires, and he hardens whom he desires.