sum: Or, chief, principal point, in both which senses κεφαλαιον: strong:G2774 is used by profane writers.
We have: Hebrews 7:26-28
who: Hebrews 1:3, Hebrews 1:13, Hebrews 10:12, Hebrews 12:2; Ephesians 6:20; Colossians 3:1; Revelation 3:21
the Majesty: 1 Chronicles 29:11; Job 37:22; Psalms 21:5, Psalms 45:3-4, Psalms 104:1, Psalms 145:12; Isaiah 24:14; Micah 5:4