John Gill Bible Commentary

As the mountains are round about Jerusalem,.... There was Mount Zion on the side of the north, and the mount of Olives on the east, and other mountains on the other sides of it; so that it was encompassed with them, and was naturally as well as artificially fortified. Tacitus (k) describes Jerusalem as inaccessible, walls and mountains, rocks and towers, surrounding it: and the poet Coerilus (l) makes mention of a people that spoke the Phoenician language, by whom he plainly means the Jews, ' , "that inhabited the mountains of Solyma"; which are spoken of by Homer (m), from whence, according to Tacitus (n), Jerusalem had its name: yet, as Kimchi observes, this did not hinder the enemy from taking it; wherefore the Lord is a greater security to his people; so the Lord is round about his people, from henceforth even for ever; he encompasses them with his favour and lovingkindness as a shield; he encircles them in the arms of everlasting love; he guards them by his providence all around, and keeps a wakeful and watchful eye over them, that nothing hurts them: he keeps them, as in a garrison, by his almighty power: these are the walls that are around them, yea, he himself is a wall of fire about them, and the glory in the midst of them, Zac 2:5; and so he continues; he never leaves his people, nor forsakes them, but is their God and guide even unto death. The Targum is, "the Word of the Lord is round about his people;'' Christ, the essential Word of God. (k) Hist. l. 5. c. 11. (l) Apud Euseb. Praerar. Evangel. l. 9. c. 9. (m) Odyss. 5. v. 283. (n) Ut supra. (Hist. l. 5. c. 11.)