Contradiction with Isaiah 59:2
Isaiah 59:2 states that iniquities separate people from God, contradicting Isaiah 30:19, which suggests God will answer when people cry out to Him.
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. [have hid: or, have made him hide]
Contradiction with Proverbs 28:9
Proverbs 28:9 indicates that if one turns away from hearing the law, their prayer is an abomination, contrasting Isaiah 30:19's promise of answered prayer.
Proverbs 28:9: He that turneth away his ear from hearing the law, even his prayer [shall be] abomination.
Contradiction with Micah 3:4
Micah 3:4 states that God will hide His face and not hear people because of their evil deeds, conflicting with Isaiah 30:19's assurance of God's response.
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.
Contradiction with James 4:3
James 4:3 mentions that prayers may not be answered due to wrong motives, challenging the promise of Isaiah 30:19 that God will hear and respond.
James 4:3: Ye ask, and receive not, because ye ask amiss, that ye may consume [it] upon your lusts. [lusts: or, pleasures]