Isaiah 16:12

16:12 When the Moabites plead with all their might at their high places,

and enter their temples to pray, their prayers will be ineffective!

Isaiah 19:22

19:22 The Lord will strike Egypt, striking and then healing them. They will turn to the Lord and he will listen to their prayers and heal them.

Isaiah 59:2

59:2 But your sinful acts have alienated you from your God;

your sins have caused him to reject you and not listen to your prayers.