Judges 14:20 - Ellicott's Commentary On The Whole Bible

To his companion, whom he had used as his friend — i.e., to the chief of the paranyraphs (the bride-conductor, LXX.); “the friend of the bride-groom” (John 3:29). Hence, even if the suspicion as to the meaning of Samson’s words in Judges 14:18 be unfounded, it is clear that there was treachery and secret hostility at work. Bunsen renders the phrase, “to his companion, whose friend (amica) she was.”