Proverbs 28:9

He that turneth away his ear from hearing the law, even his prayer shall be abomination.
– Proverbs 28:9

The word for hearing is common in Proverbs and means to hear intelligently, or with understanding. Obedience is implied. The command to hear is given frequently in the law (Exodus 4:1-8; 5:1; 8:32-34; 15:26; 24:7; Deuteronomy 5:1; 29:3; 31:11-12, 38, 30; 32:1, 44). Refusal to listen to God’s instruction renders one’s prayer an abomination, or detestable in God’s sight. Wisdom teaches God will not listen to us if we do not listen to him (Proverbs 1:23-33).