Hebrews 6:13-20 WBT

13 For when God made promise to Abraham, because he could swear by no greater, he swore 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 contradiction.
17 Wherein God, willing more abundantly to show to 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 steadfast, and which entereth into that within the vail;
20 Whither the forerunner hath for us entered, [even] Jesus, made a high priest for ever after the order of Melchisedec.