ὁρκωμοσία

the taking of an oath, an oath

Definition

The Greek word ὁρκωμοσία (orkōmosia) specifically means 'the act of swearing an oath' or 'the oath itself.' It refers to the formal, solemn invocation of God or a sacred object to guarantee the truth of a statement or the fulfillment of a promise. In the New Testament, it is used exclusively in the context of God's own binding promises. In Hebrews 7:20-21 and 7:28, the term describes the irrevocable oath by which God appointed Jesus as a permanent high priest in the order of Melchizedek, contrasting it with the Levitical priesthood established without such a divine oath.

Biblical Usage

This word is used only in the Epistle to the Hebrews, specifically in chapter 7, where it appears three times (Hebrews 7:20, 7:21, 7:28). Its usage is highly specialized, focusing on the theological argument about priesthood. The author uses it to highlight the superior and permanent nature of Christ's priesthood, which was inaugurated by God's own oath, unlike the older Levitical system.

Etymology

Derived from the Greek words ὅρκος (horkos), meaning 'oath,' and ὄμνυμι (omnumi), meaning 'to swear.' Thus, ὁρκωμοσία literally means 'oath-swearing' or 'the act of taking an oath.' It is a compound noun that emphasizes the action and formal declaration involved in making a solemn vow.

Semantic Range

This word is theologically significant as it underscores the certainty and divine guarantee of God's promises. In Hebrews, it is central to the argument for the superiority of the new covenant in Christ. God's oath (ὁρκωμοσία) makes Jesus' priesthood unchangeable and eternal (Hebrews 7:24), providing believers with absolute confidence in their access to God. Understanding this term enriches reading by highlighting that our salvation rests on God's sworn, unbreakable commitment, not on a temporary or human institution.

In the ancient Greco-Roman and Jewish worlds, oaths were solemn, legally and religiously binding agreements. Invoking a deity or sacred object made the oath unbreakable, with severe consequences for violation. The author of Hebrews uses this culturally understood weight of an oath to argue that God, by swearing by Himself (since there is no one greater, Hebrews 6:13), has made the most binding guarantee possible concerning Christ's role.

ὅρκος (horkos, G3727) — the more general term for the oath itself or the curse invoked. ὁρκωμοσία emphasizes the act of swearing the oath.

Word Details

Scripture References