Contradiction with Psalm 115:17
This verse states that the dead cannot praise the Lord, while Psalms 51:15 emphasizes opening lips to praise.
Psalm 115:17: The dead praise not the LORD, neither any that go down into silence.
Contradiction with Isaiah 29:13
This verse talks about people drawing near with words but their hearts being far, contrasting with the sincerity implied in Psalms 51:15.
Isaiah 29:13: Wherefore the Lord said, Forasmuch as this people draw near [me] with their mouth, and with their lips do honour me, but have removed their heart far from me, and their fear toward me is taught by the precept of men:
Contradiction with Amos 5:21-23
God rejects insincere worship here, contrary to the open lips and praise in Psalms 51:15.
Amos 5:21-23: I hate, I despise your feast days, and I will not smell in your solemn assemblies. [in...: or, your holy days]
Contradiction with Matthew 15:8-9
Jesus criticizes vain worship, opposing the genuine praise called for in Psalms 51:15.
Matthew 15:8-9: This people draweth nigh unto me with their mouth, and honoureth me with [their] lips; but their heart is far from me.
Contradiction with Isaiah 1:15
God refuses to listen to prayers because of the people's actions, contrasting with the request to open lips in Psalms 51:15.
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. [make...: Heb. multiply prayer] [blood: Heb. bloods]