Hebrews 6:13-20
  
6:13 For when God made promise to Abraham, because he could swear by no greater, he sware by himself,
6:14 Saying, Surely blessing I will bless thee, and multiplying I will multiply thee.
6:15 And so, after he had patiently endured, he obtained the promise.
6:16 For men verily swear by the greater: and an oath for confirmation is to them an end of all strife.
6:17 Wherein God, willing more abundantly to shew unto the heirs of promise the immutability of his counsel, confirmed it by an oath:
6:18 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:
6:19 Which hope we have as an anchor of the soul, both sure and stedfast, and which entereth into that within the veil;
6:20 Whither the forerunner is for us entered, even Jesus, made an high priest for ever after the order of Melchisedec.