righteous - one apparently such; as in Mat 9:13, “I came not to call the righteous,” etc., that is, those who fancy themselves righteous. Those alone are true saints who by the grace of God persevere (Mat 24:13; 1Co 10:12; Joh 10:28, Joh 10:29).
turneth away from ... righteousness - an utter apostasy; not like the exceptional offenses of the godly through infirmity or heedlessness, which they afterwards mourn over and repent of.
not be mentioned - not be taken into account so as to save them.