¹⁷ 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.

¹⁷ Wherein God, willing more abundantly to shew unto the heirs of promise the immutability of his counsel, confirmed it by [1] an oath:

¹⁷ Wherein God, willing to shew more abundantly to the heirs of the promise the unchangeableness of his purpose, intervened by an oath,