Hebrews 6:18-20

so that by two unchangeable things [His promise and His oath] in which it is impossible for God to lie, we who have fled [to Him] for refuge would have strong encouragement and indwelling strength to hold tightly to the hope set before us. This hope [this confident assurance] we have as an anchor of the soul [it cannot slip and it cannot break down under whatever pressure bears upon it]—a safe and steadfast hope that enters within the veil [of the heavenly temple, that most Holy Place in which the very presence of God dwells], [Lev 16:2] where Jesus has entered [in advance] as a forerunner for us, having become a High Priest forever according to the order of Melchizedek. [Ps 110:4]