Matthew Poole and continuators on Hebrews 7:2

2 To whom also Abraham gave a tenth part of all : first being by interpretation King of righteousness , and after that also King of Salem, which is King of peace .

By which tything to him, Abraham owns him to be God's Priest. As he had received blessing from God by him, so he returns to God, through him, his Acknowledgments, he divided, shared, and gave out his part to him, even the tenth part of all the Spoils, v. 4. This is the first Scripture, Gen. 14.20. that gives us any account of paying the Tenths of Goods to God in his Priests; which Custom afterwards obtained among most Nations, to give the Tenths of the Spoils after Victory to God. And this Abraham did, as due to the Office by divine Institution, having received a Blessing from it.

The Mystery of his Name, Title and Descent, the Holy Ghost now opens to them. His Name is a compound of [non-Latin text not transcribed] or [non-Latin text not transcribed] which signifieth a King or Governour, or my King, and [non-Latin text not transcribed] Righteousness. A supreme Governour, not only formally righteous in his own Disposition, but efficiently by just and excellent Laws making his Subjects righteous; a King working Righteousness in a Canaan, and in such a time of universal Degeneracy from it. This God ordered for some special use, viz. to type out his own Son, God-Man, the great Gospel-Minister to be the King of Righteousness, who purchased it for, imputeth it to, and infuseth it into Sinners; who is so fully the Lord our Righteousness, that we are made the Righteousness of God in him, Isa. 32.1. Ier. 23.6. and 33.16. Zech. 9.9. and 2 Cor. 5.21.

The Mystery of his Title of Office, King of Salem: The due order of this is observable; he is first, King of Righteousness, and after that he is King of Salem, that is, of Peace; the Fruit of whose righteous Government was Peace. He kept this among his People, and round about him, while others were wasting and destroying their Kingdoms by Lusts and Wars. This is eminently true of Christ The Prince of Peace. Isai. 9.6, 7. who gave some signal of his Government, and begun his Priesthood in the same Salem or Ierusalem, where Melchisedec reigned, Matth. 21.5, 9, 10. He is eminently the Royal Purchaser, Maker, and Distributer of Peace, reconciling all things to God, Angels and Men in Heaven and in Earth, and all Persons, Iews and Gentiles, and the Creation it self to recovered Man, Colos. 1.20, 21. comp. Ephes. 2.13, to 18. The Prince and Price of our Peace, setting Peace within Souls, giving it to them without, Peace, spiritual, temporal, and eternal; his Kingdom aboundeth in it, Psalm 72.1, 3, 7. Isa. 54.10, 13. Iohn 14.27. Iames 3.18.