New Living Translation
It would be better if they had never known the way to righteousness than to know it and then reject the command they were given to live a holy life.

American Standard Version
For it were better for them not to have known the way of righteousness, than, after knowing it, to turn back from the holy commandment delivered unto them.

Berean Study Bible
It would have been better for them not to have known the way of righteousness than to have known it and then to turn away from the holy commandment passed on to them.

Douay-Rheims Bible
For it had been better for them not to have known the way of justice, than after they have known it, to turn back from that holy commandment which was delivered to them.

English Revised Version
For it were better for them not to have known the way of righteousness, than, after knowing it, to turn back from the holy commandment delivered unto them.

King James Bible
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.

World English Bible
For it would be better for them not to have known the way of righteousness, than, after knowing it, to turn back from the holy commandment delivered to them.

Young's Literal Translation
for it were better to them not to have acknowledged the way of the righteousness, than having acknowledged it, to turn back from the holy command delivered to them,

2 Peter 2:21 Additional Translations ...