Exodus 10:3

And Moses and Aaron came in unto Pharaoh
As the Lord commanded them, for what is before said to Moses was designed for Aaron also, his prophet and spokesman:

and said unto him, thus saith the Lord God of the Hebrews;
as the ambassadors of the God of Israel, and in his name said:

how long wilt thou refuse to humble thyself before me?
to acknowledge his offence, lie low before God, and be subject to his will; he had humbled himself for a moment, but then this did not continue; what God expected of him, and complains of the want of, was such a continued humiliation before him, and such a subjection to him, as would issue in complying with what he had so often demanded of him, and is as follows:

let my people go, that they may serve me;
see ( Exodus 9:1 Exodus 9:13 ) .