“"Through this" oath "God desired to show more convincingly to the heirs of the promise" that God's promise, because indeed it is God's, will never be changed. God's oath was infallible in its being interposed, that is, between God, the angel and Abraham.”
Ephrem the Syrian, 4th c. — COMMENTARY ON THE EPISTLE TO THE HEBREWS
Original
17Wherein God, willing more abundantly to shew unto the heirs of promise the immutability of his counsel, confirmed it by an oath:
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In context
15And so, after he had patiently endured, he obtained the promise.
16For men verily swear by the greater: and an oath for confirmation is to them an end of all strife.
— Hebrews 6:17 —
18That by two immutable things, in which it was impossible for God to lie, we might have a strong consolation, who have fled for refuge to lay hold upon the hope set before us:
19Which hope we have as an anchor of the soul, both sure and stedfast, and which entereth into that within the veil;