Hebrews 3:12

12 See to it, brothers and sisters, that none of you has a sinful, unbelieving heart that turns away from the living God.

Read Hebrews 3:12 Using Other Translations

Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God.
Take care, brothers, lest there be in any of you an evil, unbelieving heart, leading you to fall away from the living God.
Be careful then, dear brothers and sisters. Make sure that your own hearts are not evil and unbelieving, turning you away from the living God.