Exodus 10:20-22

Amplified Bible

²⁰ But the Lord hardened Pharaoh’s heart [so that it was even more resolved and obstinate], and he did not let the Israelites go.

Darkness over the Land

²¹ Then the Lord said to Moses, “Stretch out your hand toward the sky, so that ^[a]darkness may come over the land of Egypt, a darkness which [is so awful that it] may be felt.” ²² So Moses stretched out his hand toward the sky, and for three days a thick darkness was all over the land of Egypt [no sun, no moon, no stars].