American Standard Version
But Jehovah hardened Pharaoh's heart, and he did not let the children of Israel go.

Berean Study Bible
But the LORD hardened Pharaoh’s heart, and he would not let the Israelites go.

Douay-Rheims Bible
And the Lord hardened Pharao's heart, neither did he let the children of Israel go.

English Revised Version
But the LORD hardened Pharaoh's heart, and he did not let the children of Israel go.

King James Bible
But the LORD hardened Pharaoh's heart, so that he would not let the children of Israel go.

World English Bible
But Yahweh hardened Pharaoh's heart, and he didn't let the children of Israel go.

Young's Literal Translation
and Jehovah strengtheneth the heart of Pharaoh, and he hath not sent the sons of Israel away.

Exodus 10:20 Additional Translations ...