Ephrem the Syrian, on Gen 14:18

“But Melchisedech the king of Salem, bringing forth bread and wine, for he was the priest of the most high God,”

“This Melchizedek is Shem, who became a king due to his greatness; he was the head of fourteen nations. In addition, "he was a priest." He received this from Noah, his father, through the rights of succession. Shem lived not only to the time of Abraham, as Scripture says, but even to [the time of] Jacob and Esau, the grandsons of Abraham. It was to him that Rebekah went to ask and was told, "Two nations are in your womb, and the older shall be a servant to the younger." Rebekah would not have bypassed her husband, who had been delivered at the high place, or her father-in-law, to whom revelations of the divinity came continually, and gone straight to ask Melchizedek unless she had learned of his greatness from Abraham or Abraham's son.”

Imported from an open dataset — not yet checked against the printed edition.