Contradiction with Jeremiah 17:9
Contradicts the call to heed one's heart in Hebrews 3:7 by highlighting the deceitfulness of the heart.
Jeremiah 17:9: The heart [is] deceitful above all [things], and desperately wicked: who can know it?
Contradiction with Proverbs 28:26
Advises against trusting one's own heart, contrasting with the encouragement in Hebrews 3:7 to listen to the voice speaking.
Proverbs 28:26: He that trusteth in his own heart is a fool: but whoso walketh wisely, he shall be delivered.
Contradiction with Matthew 13:15
Speaks of people hardening their hearts, which contradicts the call in Hebrews 3:7 to not harden your hearts.
Matthew 13:15: For this people's heart is waxed gross, and [their] ears are dull of hearing, and their eyes they have closed; lest at any time they should see with [their] eyes, and hear with [their] ears, and should understand with [their] heart, and should be converted, and I should heal them.
Contradiction with 2 Timothy 3:7
Talks about always learning and never coming to the knowledge of truth, contrasting with the direction to heed to the Holy Spirit's voice in Hebrews 3:7.
2 Timothy 3:7: Ever learning, and never able to come to the knowledge of the truth.
Contradiction with James 1:22
Encourages doing the word and not just hearing, contradicting the implication that just hearing in Hebrews 3:7 is sufficient.
James 1:22: But be ye doers of the word, and not hearers only, deceiving your own selves.