1 Timothy 1:7

“Desiring to be teachers of the law, etc.] They were very fond of being called Rabbi, Rabbi, and styled doctors of the law, and of being thought to have skill in interpreting the law, and good talents in expounding it, and preaching upon it; which was now most in vogue, and gained the greatest applause, when the preaching of the Gospel was treated with contempt, not only by the unbelieving Jews, but by judaizing Christians, and carnal professors. Understanding neither what they say, nor whereof they affirm: they did not understand the law, the nature and end, the purity and spirituality, and perfection of it, which they were so fond of teaching, and went into many foolish and unlearned…”

“Sample of their "vain talk" (Ti1 1:6). Desiring--They are would-be teachers, not really so. the law--the Jewish law (Tit 1:14; Tit 3:9). The Judaizers here meant seem to be distinct from those impugned in the Epistles to the Galatians and Romans, who made the works of the law necessary to justification in opposition to Gospel grace. The Judaizers here meant corrupted the law with "fables," which they pretended to found on it, subversive of morals as well as of truth. Their error was not in maintaining the obligation of the law, but in abusing it by fabulous and immoral interpretations of, and additions to, it. neither what they say, nor whereof--neither understanding their own assertions,…”

“Desiring to be teachers of the law - That is, to have the credit and reputation of being well versed in the law of Moses, and qualified to explain it to others. This was a high honor among the Jews, and these teachers laid claim to the same distinction. Understanding neither what they say - That is, they do not understand the true nature and design of that law which they attempt to explain to others. This was true of the Jewish teachers, and equally so of those in the church at Ephesus, who attempted to explain it. They appear to have explained the law on the principles which commonly prevailed among the Jews, and hence their instructions tended greatly to corrupt the faith of the gospel.…”

“Understanding neither the very things they speak, nor the subject they speak of. 1 Timothy 1:8”

“1:7 Their aspirations to be teachers of the law of Moses were ironic; their handling of the law was deficient in the light of the Good News, and they neither understood nor fulfilled the law (see 1:8-11).”

“to: Act 15:1; Rom 2:19-21; Gal 3:2, Gal 3:5, Gal 4:21, Gal 5:3, Gal 5:4; Tit 1:10, Tit 1:11 understanding: Ti1 6:4; Isa 29:13, Isa 29:14; Jer 8:8, Jer 8:9; Mat 15:14, Mat 21:27, Mat 23:16-24; Joh 3:9, Joh 3:10; Joh 9:40, Joh 9:41; Rom 1:22; Ti2 3:7; Pe2 2:12 1 Timothy 1:8”