2 John 1:8

Compromise with the false teachers could lead to a loss of reward (cf. the warning passages in Hebrews). [Note: Barker, pp. 364-65; Marshall, p. 72.] Moreover loss for John’s readers would involve loss for him as well since he had a share in their lives. This loss would only be partial, however. They would still receive some reward (cf. 1 Corinthians 3:11-15). [Note: See Zane C. Hodges, "2 John," in The Bible Knowledge Commentary: New Testament, p. 907.] Loss of salvation is not in view at all.

"The readers are warned to take heed that the deceivers do not undo the work which the apostles and evangelists had done, so that they might receive a full reward." [Note: Ryrie, p. 1480.]

"John is anxious that they shall hold on with him to the finish." [Note: A. T. Robertson, Word Pictures in the New Testament, 6:253.]