Hebrews 6:16

13 For when God made promise to Abraham, because he could swear by no greater, he sware by himself,

14 Saying, Surely blessing I will bless thee, and multiplying I will multiply thee.

15 And so, after he had patiently endured, he obtained the promise.

16 For men verily swear by the greater: and an oath for confirmation [is] to them an end of all strife.

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

18 That 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:

19 Which [hope] we have as an anchor of the soul, both sure and stedfast, and which entereth into that within the veil;