Parallel
Exodus 4:21
Jewish Publication Society 1917 · Berean Standard Bible
And the LORD said unto Moses: ‘When thou goest back into Egypt, see that thou do before Pharaoh all the wonders which I have put in thy hand; but I will harden his heart, and he will not let the people go.
The LORD instructed Moses, “When you go back to Egypt, see that you perform before Pharaoh all the wonders that I have put within your power. But I will harden (note: Or stiffen or strengthen) his heart so that he will not let the people go.