Isaiah 1:16

16. Wash you The allusion here is doubtless to the injunction on priests, who, on pain of death, (Exodus 30:19-21,) had to wash hands and feet before they ministered at the altar. The symbol, no doubt, was at once understood by these worldly men now before the prophet: the expression did not seem to them an abrupt transition to another subject. Before they could offer “the earnest, effectual prayer of the righteous man,” they must pray not in alarm merely, but with deep repentance. They must cease to do evil.