Equally simple:
1 Samuel 8:18 And ye shall cry out in that day because of your king which ye shall have chosen you; and the LORD will not hear you in that day.
Job 35:13 Surely God will not hear vanity, neither will the Almighty regard it.
Psalm 66:18 If I regard iniquity in my heart, the Lord will not hear me:
Isaiah 1:15 And when ye spread forth your hands, I will hide mine eyes from you: yea, when ye make many prayers, I will not hear: your hands are full of blood.
Isaiah 30:9 That this is a rebellious people, lying children, children that will not hear the law of the LORD:
Isaiah 59:2 But your iniquities have separated between you and your God, and your sins have hid his face from you, that he will not hear.
Jeremiah 7:16 Therefore pray not thou for this people, neither lift up cry nor prayer for them, neither make intercession to me: for I will not hear thee.
Jeremiah 11:14 Therefore pray not thou for this people, neither lift up a cry or prayer for them: for I will not hear them in the time that they cry unto me for their trouble.
Jeremiah 13:17 But if ye will not hear it, my soul shall weep in secret places for your pride; and mine eye shall weep sore, and run down with tears, because the LORD'S flock is carried away captive.
Jeremiah 14:12 When they fast, I will not hear their cry; and when they offer burnt offering and an oblation, I will not accept them: but I will consume them by the sword, and by the famine, and by the pestilence.
Jeremiah 22:5 But if ye will not hear these words, I swear by myself, saith the LORD, that this house shall become a desolation.
Jeremiah 22:21 I spake unto thee in thy prosperity; but thou saidst, I will not hear. This hath been thy manner from thy youth, that thou obeyedst not my voice. {prosperity: Heb. prosperities}
Amos 5:23 Take thou away from me the noise of thy songs; for I will not hear the melody of thy viols.
Micah 3:4 Then shall they cry unto the LORD, but he will not hear them: he will even hide his face from them at that time, as they have behaved themselves ill in their doings.
Malachi 2:2 If ye will not hear, and if ye will not lay it to heart, to give glory unto my name, saith the LORD of hosts, I will even send a curse upon you, and I will curse your blessings: yea, I have cursed them already, because ye do not lay it to heart.
Acts 3:23 And it shall come to pass, that every soul, which will not hear that prophet, shall be destroyed from among the people.