Genesis 14:19 - Matthew Poole's English Annotations on the Holy Bible

And, or therefore, (as the particle is oft taken, i.e. because he was a priest of God), he (i.e. Melchizedek) blessed him, (Abram,) which was one act of the priestly office. See Poole on "Hebrews 7:6". See Poole on "Hebrews 7:7". So it is a prayer for him, that God would confirm and increase the blessing which he had given him. Or, blessed is; so it is an acknowledgment of God's blessing conferred upon Abram both formerly, and in this late and great victory. Or, blessed shall be; so it is a prediction concerning his future and further blessedness, whereof this was only an earnest.