NET
21 For it would have been better for them never to have known the way of righteousness than, having known it, to turn back from the holy commandment that had been delivered to them.
Darby
21 For it were better for them not to have known the way of righteousness, than having known [it] to turn back from the holy commandment delivered to them.
KJV
21 For it had been better for them not to have known the way of righteousness, than, after they have known [it], to turn from the holy commandment delivered unto them.