Mark 5:7

Thou Son of the most high God. — This is the first occurrence of the name in the New Testament, and is therefore a fit place for a few words as to its history. As a divine name “the Most High God” belonged to the earliest stage of the patriarchal worship of the one Supreme Deity. Melchizedek appears as the priest of “the Most High God” (Genesis 14:18). It is used by Balaam as the prophet of the wider Semitic monotheism (Numbers 24:16), by Moses in the great psalm of Deuteronomy 32:8. In the Prophets and the Psalms it mingles with the other names of God (Isaiah 14:14; Lamentations 3:35; Daniel 4:17; Daniel 4:24; Daniel 4:32; Daniel 4:34; Daniel 7:18; Daniel 7:22; Daniel 7:25; Psalms 7:17; Psalms 9:2; Psalms 18:13; ; Matthew 10:28, et al.)

I know... — This has seemed to have a natural meaning if it is the authority given to John’s witness, but to be less fitting if applied to the Father’s. In two of the oldest MSS., and some of the earliest versions, we read “ye know,” and this has been adopted by some modern editors; but the origin of this reading is obvious, and there is no sufficient reason for departing from the common text. Its meaning is quite in harmony with the relation of the Son to the Father, which has been dwelt upon. The Father beareth witness, is bearing witness (comp. John 5:37), in the unity of work which Son and Father alike work (John 5:17; John 5:19; John 5:30), and the Son knows that His power to do this work can come from no other source. His own nature responds to the Father’s voice; He knows it to be true. (Comp. John 3:33.)