King James Version
But God be thanked, that ye were the servants of sin, but ye have obeyed from the heart that form of doctrine which was delivered you.English Standard Version
But thanks be to God, that you who were once slaves of sin have become obedient from the heart to the standard of teaching to which you were committed,New International Version
But thanks be to God that, though you used to be slaves to sin, you wholeheartedly obeyed the form of teaching to which you were entrusted.