Hebrews 6:13

6:13 Now when God made his promise to Abraham, since he could swear by no one greater, he swore by himself,

Hebrews 6:17

6:17 In the same way ¹  God wanted to demonstrate more clearly to the heirs of the promise that his purpose was unchangeable, ²  and so he intervened with an oath,

¹ tn Grk “in which.”

² tn Or “immutable” (here and in v. 18); Grk “the unchangeableness of his purpose.”