Matthew 15:8
These people [claim to] honor me with their lips [i.e., by what they say], but their heart is far from [honoring] me.
John 1:47
[As] Jesus saw Nathaniel coming toward Him, He said [this] about him, "Look, [there is] a true Israelite, a completely honest man!"
Acts 8:21
You do not have any share or involvement in this matter because your heart is not right before God.
Hebrews 3:12
Pay attention, brothers, so that there will not be in any one of you an evil heart of unbelief, [resulting] in falling away from the living God.
1 Peter 3:10
For [Psalm 39:12 says], "The person who loves [his] life and wants to have happy days, should avoid saying anything bad or deceptive.