Exodus 8:28-30

Amplified Bible

²⁸ So Pharaoh said, “I will let you go, so that you may sacrifice to the Lord your God in the wilderness; only you shall not go very far away. Plead [with your God] for me.” ²⁹ Moses said, “I am going to leave you, and I will urgently petition (pray, entreat) the Lord that the swarms of insects may leave Pharaoh, his servants, and his people tomorrow; only do not let Pharaoh act deceitfully again by not letting the people go to sacrifice to the Lord.”

³⁰ So Moses left Pharaoh and prayed to the Lord [on behalf of Pharaoh].