John Gill's Exposition of the Whole Bible
Isaiah 31:6
Turn ye unto [him],.... From the Egyptians, to whom they sought for help, unto the Lord, they had neglected; from evil ways and practices, idolatry and impiety, by repentance and reformation; to the true worship of God, to his word and ordinances, statutes and commands. The Targum is,
"turn to the law;''
which they had rejected and broken. These are the words of the prophet, a call of his to the people to repentance, to which they might be induced by the gracious declaration of the Lord unto them, in the preceding verses, promising them preservation and safety:
[from] whom the children of Israel have deeply revolted: or, "made deep a revolt" u; had gone very far back from God, and deep into sin and ruin, that their recovery was difficult; and yet their return was absolutely necessary, which ought to be done both speedily and heartily. Some think reference is had to the deep schemes they had laid, those political ones, at least, which they thought were such, in applying to Egypt for help, when they, as it is said, Isaiah 29:15 sought "deep to hide their counsel front the Lord"; in doing which they deeply departed from him, and are here called to return to him. This is said not of the ten tribes, that were gone into captivity, but of the Jews, who were the posterity of Israel also; which is mentioned, to put them in mind of their descent, as an aggravation of their sin, and as an argument for their return.
u העמיקו סרה Heb. "profundam fecerunt recessionem", Piscator; "profundaverunt defevtionem", Montanus