A.T. Robertson Commentary Hebrews 6:16

"For men swear by the greater: and in every dispute of theirs the oath is final for confirmation." — Hebrews 6:16 (ASV)

In every dispute (πασης αντιλογιας). Objective genitive of old word several times in Hebrews (6:16; 7:7; 12:3). Talking back, face to face, in opposition.

Final (περας). Limit, boundary (Matthew 12:42). Men may perjure themselves.