teaching for doctrines the commandments of men; that is, teaching the people to observe the traditions of the elders, the decrees and determinations of the doctors, as if they were doctrines delivered by God himself; or, instead of the doctrines contained in the Bible, which lay neglected by them, they obtruded on them the orders, and injunctions of men. In the text in Isaiah, are only these words, "taught by the precept of men": and which relate to their fear and worship of God; and which is here interpreted of their teachers teaching them it, and that explained of the commandments of men; as if, instead of "taught", it had been read, "teaching". The Jews have no reason to quarrel with this construction and sense, since their Targum paraphrases it thus; "and their fear before me is, , according to the commandment of men that teach": and a noted commentator (c) of their's has this remark on the text, "their fear towards me is" not with a perfect heart, but "by the commandment , of the men that teach them".
(c) R. Sol. Jarchi in Isaiah 29.13.