Proverbs 28:9 If a person will not *listen to **Torah, even his prayer is an ***abomination.

*Hebrew understanding of “listen” is to “hear and obey.”  It is active!  Not just “in one ear and out the other.”  You hear and do.  You actively obey what you hear.

A primitive root; to hear intelligently (often with implication of attention, obedience, etc.; causatively to tell, etc.): –  X attentively, call (gather) together, X carefully, X certainly, consent, consider, be content, declare, X diligently, discern, give ear, (cause to, let, make to) hear (-ken, tell), X indeed, listen, make (a) noise, **(be) obedient, obey,** perceive, (make a) proclaim (-ation), publish, regard, report, shew (forth), (make a) sound, X surely, tell, understand, whosoever [heareth], witness.

**This word Torah is usually translated “law.” Better translated instructions. You have the Torah (5 books of Moses) or (as stated in the New Testament in a number of places, i.e. Galations) they may be talking about the the (ADDED-TO) Torah.  Added-to = BAD  God’s Law = GOOD
In this case the “law” referred to is “Torah”
תּרה    תּורה
tôrâh  tôrâh
to-raw’, to-raw’
From H3384; a precept or statute, especially the Decalogue or Pentateuch: – law.

תּעבה    תּועבה
tô‛êbah  tô‛êbah
to-ay-baw’, to-ay-baw’
Feminine active participle of H8581; properly something disgusting (morally), that is, (as noun) an abhorrence; especially idolatry or (concretely) an idol: – abominable (custom, thing), abomination.