And afterward Moses and Aaron went in, and told Pharaoh, Thus saith the LORD God of Israel, Let my people go, that they may hold a feast unto me in the wilderness.
Moses and Aaron went. As representatives of the Hebrews, they were entitled to ask an audience of the king, and their thorough Egyptian training taught them how and when to seek it.
And told Pharaoh. When introduced, they delivered a message in the name of the God of Israel. This is the first time He is mentioned by that national appellation in Scripture. It seems to have been used by divine direction (Exodus 4:22), and designed to put honour on the Hebrews in their depressed condition (Hebrews 11:16).