Verse

2 Peter 2:21

A church father on this verse
To know the way of righteousness is to know Christ and the holy gospel. Peter is talking here about people who have been baptized after professing faith in Jesus but who have then turned away from him.
Hilary of Arles, 5th c. — INTRODUCTORY COMMENTARY ON 2 PETER
Original

21For 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.

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In context

19While they promise them liberty, they themselves are the servants of corruption: for of whom a man is overcome, of the same is he brought in bondage.

20For if after they have escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning.

2 Peter 2:21

22But it is happened unto them according to the true proverb, The dog is turned to his own vomit again; and the sow that was washed to her wallowing in the mire.

Read all of 2 Peter 2