King James Version
Wherein God, willing more abundantly to shew unto the heirs of promise the immutability of his counsel, confirmed it by an oath:New International Version
Because God wanted to make the unchanging nature of his purpose very clear to the heirs of what was promised, he confirmed it with an oath.Catholic Public Domain Version
In this matter, God, wanting to reveal more thoroughly the immutability of his counsel to the heirs of the promise, interposed an oath