This is direct quotation. It can also be stated as an indirect quotation: “Melchizedek blessed Abram and asked that God Most High who owns heaven and earth would bless Abram.” (See: [[rc://en/ta/man/translate/figs-quotations]])
The people of Canaan worshiped many false gods. The title **Most High God** explains that the God that Melchizedek worshiped was far superior to all of them, and was the same God that Abram worshiped.