Psalms 50:17 - Joseph Benson’s Commentary on the Old and New Testaments

Seeing thou hatest instruction Seeing thy practice contradicts thy profession, and makes thee a notorious and impudent liar. For though with thy mouth thou showest much love to my statutes and counsels, yet, in truth, thou hatest them, as they oppose and hinder the gratification of thy beloved lusts, and are the instruments of thy just condemnation, and a manifest reproach to thy conduct. Or, seeing thou hatest reproof as מוסר, musar, is often rendered. And this, above all other parts of God's word, is most hateful to ungodly men; and, therefore, this is fitly alleged as an evidence of their wickedness. And castest my words behind thee As men do things which they abhor and despise.