Hebrews 4:2

4:2 For we had good news proclaimed to us just as they did. But the message they heard did them no good, since they did not join in with those who heard it in faith.

Hebrews 12:15

12:15 See to it that no one comes short of the grace of God, that no one be like a bitter root springing up and causing trouble, and through him many become defiled.