16 “And the fire was kindled in their company; the flame burnt up the sinners”. This word is not in Scripture usually applied to those, who, although they live righteously, and in a praiseworthy manner, are not without sin. Rather, as there is a difference between those who scorn and scorners, between men who murmur and murmurers, between men who are writing and writers, and so forth; so Scripture is wont to signify by sinners such as are very wicked, and laden with heavy loads of sins.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)