Plead with your mother, plead: for she is not my wife, neither am I her husband: let her therefore put away her whoredoms out of her sight, and her adulteries from between her breasts;
Plead with your mother, plead - expostulate.
Mother - i:e. the nation collectively. The address is to 'her children' - i:e., to, the individual citizens of the state (cf. Isaiah 50:1, "Thus saith the Lord, Where is the bill of your mother's divorcement, whom I have put away?") The adulterous mother was the synagogue, the individuals deceived by her were the sons. The latter, when tuned to God, must plead with their mother that she turn also. When involved in her judgments, they must plead with her, and not accuse God. God had not forgotten to be gracious, but she kept not His love (Pusey).
For she is not my wife - she has deprived herself of her high privilege by spiritual adultery.
Let her therefore put away her whoredoms out of her sight - rather, 'from her face.'
And her adulteries from between her breasts. Her very countenance unblushingly betrayed her lust, as did also her exposed "breasts."