Hebrews 12:15

12:15 looking carefully lest there be any man who falls short of the grace of God; lest any root of bitterness springing up trouble you, and thereby the many be defiled;
-World English Bible

Other Translation

12:15 Looking diligently lest any man fail of the grace of God; lest any root of bitterness springing up trouble [you], and thereby many be defiled;
-King James Version