Albert Barnes Commentary Exodus 5:1

"And afterward Moses and Aaron came, and said unto Pharaoh, Thus saith Jehovah, the God of Israel, Let my people go, that they may hold a feast unto me in the wilderness." — Exodus 5:1 (ASV)

Pharaoh - This king, probably Tothmosis II, the great-grandson of Aahmes (Exodus 1:8), the original persecutor of the Israelites, must have been resident at this time in a city, probably Tanis (Exodus 2:5), of Lower Egypt, situated on the Nile.

The Lord God - Yahweh God of Israel demanded the services of His people. The demand, according to the general views of the pagans, was just and natural; the Israelites could not offer the necessary sacrifices in the presence of Egyptians.