Parallel
Exodus 11:10
Brenton's English Septuagint · Berean Standard Bible
And Moses and Aaron wrought all these signs and wonders in the land [of] Egypt before Pharao; and the Lord hardened the heart of Pharao, and he did not hearken to send forth the children of Israel out of the land of Egypt.
Moses and Aaron did all these wonders before Pharaoh, but the LORD hardened (note: Or stiffened or strengthened) Pharaoh’s heart so that he would not let the Israelites go out of his land.