'Letting' in the Bible

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.”

Since you are still [arrogantly] exalting yourself [in defiance] against My people by not letting them go,