“Brothers and sisters: God is not unjust so as to overlook your work and the love you have demonstrated for his name by having served and continuing to serve the holy ones.
We earnestly desire each of you to demonstrate the same eagerness for the fulfillment of hope until the end, so that you may not become sluggish, but imitators of those who, through faith and patience, are inheriting the promises.
When God made the promise to Abraham, since he had no one greater by whom to swear, “he swore by himself,” and said, “I will indeed bless you and multiply” you.
And so, after patient waiting, he obtained the promise.
Human beings swear by someone greater than themselves; for them an oath serves as a guarantee and puts an end to all argument.
So when God wanted to give the heirs of his promise an even clearer demonstration of the immutability of his purpose, he intervened with an oath, so that by two immutable things, in which it was impossible for God to lie, we who have taken refuge might be strongly encouraged to hold fast to the hope that lies before us.
This we have as an anchor of the soul, sure and firm, which reaches into the interior behind the veil, where Jesus has entered on our behalf as forerunner, becoming high priest forever according to the order of Melchizedek.” – Hebrews 6:10-20.