Proverbs 28:9 New English Translation

⁹The one who turns away his ear^[a] from hearing the law,
even his prayer^[b] is an abomination.^[c]

Proverbs 28:9 sn The expression “turn away the ear from hearing” uses a metonymy to mean that this individual will not listen—it indicates a deliberate refusal to follow the instruction of the law.
Proverbs 28:9 sn It is hard to imagine how someone who willfully refuses to obey the law of God would pray according to the will of God. Such a person is more apt to pray for some physical thing or make demands on God. (Of course a prayer of repentance would be an exception and would not be an abomination to the Lord.)
Proverbs 28:9 sn C. H. Toy says, “If a man, on his part, is deaf to instruction, then God, on his part, is deaf to prayer” (Proverbs [ICC], 499). And W. McKane observes that one who fails to attend to God’s law is a wicked person, even if he is a man of prayer (Proverbs [OTL], 623).

New English Translation (NET)