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 Exo 9:1.