Genesis 14:19

he blessed him Melchizedek, as a priest, blessed Abram for his courageous and chivalrous action. A stranger in the land, he had come to the rescue of its people.

of God Most High i.e. by God Most High. The blessing of El Elyonis invoked by Melchizedek upon Abram, the servant of Jehovah.

possessor of heaven and earth R.V. marg. maker. The word is poetical. It expresses the ideas of making, producing, creating, as in Deuteronomy 32:6; Psalms 139:13; Proverbs 8:22. It is more often used for "acquiring" (cf. Genesis 4:1), a sense which would not here be applicable. In Isaiah 1:3, it is found, as here, with the meaning of "owner."