For they have consulted together with one consent: they make a covenant against you:
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Augustine of Hippo
5. "Since they have imagined with one consent; together against Thee have they disposed a testament" (ver. 5): as though they could be the stronger. In fact, "a testament" is a name given in the Scriptures not only to that which is of no avail till the death of the testators, but every convenant and decree they used to call a testament. For Laban and Jacob made a testament, which was certainly to have force between the living; and such cases without number are read in the words of God. Then he begins to make mention of the enemies of Christ, under certain proper names of nations; the interpretation of which names sufficiently indicates what he would have to be understood. For by such names are most suitably figured the enemies of the truth. "Idumaeans," for instance, are interpreted either "men of blood," or "of earth." "Ismaelites," are "obedient to themselves," and therefore not to God, but to themselves. "Moab," "from the father;" which in a bad sense has no better explanation, than by considering it so connected with the actual history, that Lot, a father, by the illicit intercourse procured by his daughter, begat him; since it was from that very circumstance he was so named. Good, however, was his father, but as "the Law is good if one use it lawfully," not impurely and unlawfully. "Hagarens," proselytes, that is strangers, by which name also are signified, among the enemies of God's people, not those who become citizens, but those who persevere in a foreign and alien mind, and when an opportunity of doing harm occurs, show themselves. "Gebal," "a vain valley," that is, humble in pretence. "Amon," "an unquiet people," or "a people of sadness." "Amalech," "a people licking;" whence elsewhere it is said, "and his enemies shall lick the earth." The "alien race," though by their very name in Latin, they sufficiently show themselves to be aliens, and for this cause of course enemies, yet in the Hebrew are called "Philistines," which is explained, "falling from drink," as of persons made drunken by worldly luxury. "Tyre" in Hebrew is called Sor; which whether it be interpreted straitness or tribulation, must be taken in the case of these enemies of God's people in that sense, of which the Apostle speaks, "Tribulation and straitness on every soul of man that doeth evil." All these are thus enumerated in the Psalms: "The tabernacles of the Edomites, Ishmaelites, Moab and the Hagarenes, Gebal, and Amon, and Amalech, and the Philistines with those who inhabit Tyre."
6. And as if to point out the cause why they are enemies of God's people, he adds, "For Assur came with them." Now Assur is often used figuratively for the devil, "who works in the children of disobedience," as in his own vessels, that they may assail the people of God. "They have holpen the children of Lot," he saith: for all enemies, by the working in them of the devil, their prince, "have holpen the children of Lot," who is explained to mean "one declining." But the apostate angels are well explained as the children of declension, for by declining from truth they swerved to become followers of the devil. These are they of whom the Apostle speaks: "Ye wrestle not against flesh and blood, but against principalities and powers, and the rulers of the darkness of this world, against spiritual wickedness in high places." Those invisible enemies are holpen then by unbelieving men, in whom they work in order to assail the people of God.