NET
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 it many become defiled.
Darby
15 watching lest [there be] any one who lacks the grace of God; lest any root of bitterness springing up trouble [you], and many be defiled by it;
KJV
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;