John Trapp on Isaiah 1:22

Ver. 22. Thy ſilver is become droſs] Heb: droſſes. A proverbial kind of ſpeech, deciphering Apoſtacy. It is as if the Prophet had ſaid, There is nothing pure in thee, nothing ſincere or ſimple; ſed omnia fallacia, omnia fucata, omnia inquinata; but all things are deceitful, degenerate and corrupt. Droſs looketh like ſilver, and is nothing leſs: Wine mixt (or marred) with water hath the name of wine, when it is nil niſi vappa: Hypocrites are meer ſeemers, Jam, 1.26. Juglers, Job 13.16. having a form of Knowledge, Rom. 2. a form of Godlineſs, 2 Tim. 3.5. fair profeſſors they are, and foul ſinners. But be not deceived, God is not mocked; he is a faithful Metallary, ſaith a Father, and will eaſily find out mens mixtures and impoſtures. It is to be feared that he hath yet a further controverſie with this Nation for our hateful Hypocriſie and Apoſtacy: for where now alas, is our ancient fervour and forwardneſs, our heating and whetting one another? O how dull and dilute are we, &c.