Why leap ye, [1] ye high hills? In this verse there is no obscurity or ambiguity. David having said that there was only one mountain in all the world which God had chosen, calls upon the highest hills to yield it the pre-eminency. As he repeats in the plural number what had been said immediately before of Bashan, this leads me to think that he intended first to oppose that mountain, and then all other high mountains generally, to Zion. [2] Mountains are here to be understood figuratively, and the great truth conveyed is, that the kingdom of Christ, which God had begun to shadow forth in the person of David, far excels all that is reckoned glorious by the world. The reproof which the Psalmist administers, in order to humble the proud boasting of the world, is justified by that contempt which we know that carnal and ungodly persons entertain of Christ's kingdom, devoted as they are to their own pleasures or wealth, and unable to appreciate spiritual blessings. The lesson will be felt to be the more useful and necessary, if we consider that this vain pride of man rises to an additional height, when the slightest occasion is afforded for its exercise. When we see those indulging it who have no grounds to do so, we need not wonder at the arrogance of such as are possessed of wealth and influence. But the Lord's people may afford to leave them to their self-complacency, resting satisfied with the privilege of knowing that God has chosen to take up his habitation in the midst of them. They have no reason to repine at their lot so long as they have union with God, the only and the sufficient source of their happiness.

Footnotes

1 - The word here rendered leap ye "occurs only here," observes Hammond, "and is by guess rendered to leap, or lift up, or exalt one's self; but may best be interpreted, not leap as an expression of joy, but lift up, or exalt yourselves, as an effect of pride;" and he understands the meaning to be, Why do ye lift up or exalt yourselves, ye high hills, God not having chosen any of the highest hills to build his temple on, but the hill of Zion, of a very moderate size, lower than the hill of Hermon, and at the foot of it, (Psalm 133:3.) Some Jewish commentators, founding their opinion on the cognate Arabic word rtsr, would render it, to look after This gives the same sense. What look ye for? what expect ye, ye high hills, to be done to you? Ye are not those which God has chosen to beautify with his glorious presence, but mount Zion is the object of his choice. Aquila and Jerome read, "Why contend ye?" Dr Chandler renders it, "Why look askance?" i e., "with jealous leer malign," as Milton expresses it. "Why are ye jealous?" Horsley, following Jerome, has, "For what would ye contend?"

2 - "The Psalmist," says Horsley, "having settled the Israelites between their hills, proceeds to the circumstance of God's choice of a hill for the site of his temple. He poetically imagines the different hills as all ambitious of the honor, anxiously waiting God's decision, and ready to enter into a jealous contention; watching each other with an anxious eye. The lofty hill of Bashan first puts in his claim, pleading his stately height -- The hill for God is the hill of Bashan; A hill of lofty brows is the hill of Bashan. The Psalmist cuts short the contention -- For what would ye contend, ye hills of lofty brows? This is the hill desired of God for himself to dwell in; Yea, Jehovah will dwell in it for ever."

Why leap ye, ye high hills? - That is, with exultation; with pride; with conscious superiority. Why do you seem to regard yourselves as so superior to Mount Zion, in strength, in beauty, in grandeur? The Hebrew, however - רצד râtsad - rather means, "Why do ye watch insidiously? why do ye look askance at?" The word occurs only in this place. In Arabic it means to watch closely; to lie in wait for. This is the idea here. The mountains around Palestine - the mountains of the pagan world - the lofty hills - as if conscious of their grandeur, are represented as looking "askance," in their pride, at Mount Zion; as eyeing it with silent contempt, as if it were not worthy of notice; as if it were so insignificant that it had no claim to attention. The idea is not that of "leaping," as in our English Bible, or of "hopping," as in the version of the Episcopal Prayer Book, but that of a look of silent disdain, as if, by their side, Zion, so insignificant, was not worthy of regard. "Perhaps," by the high hills here, however, are disguisedly also represented the mighty powers of the pagan world, as if looking with contempt on the people of the land where Zion was the place of worship.
This is the hill which God desireth to dwell in - The hill which "he" has selected as his abode, and which "he" has honored above all the mountains of the earth, by his permanent residence there. As such, Zion has an honor above the loftiest hills and ranges of mountains in the earth.
Yea, the Lord will dwell in it for ever - Permanently; he will make it his fixed habitation on earth. Not-withstanding the envy or the contempt of surrounding hills, he will make this his settled abode. He has chosen it; he delights in it; he will not forsake it for the mountains and hills that are in themselves more grand and lofty.

Why leap ye, ye high hills? - "God said, Why leap ye, ye high hills? It is not pleasing to me to give my law upon high and towering hills. Behold, Mount Sinai is low; and the Word of the Lord has desired to place on it the Divine majesty. Moreover, the Lord dwells for ever in the heaven of heavens." - Targum.
The psalmist is speaking particularly of the mountains of Judea, and those of Gilead; the former were occupied by the Canaanites, and the others by Og, king of Bashan, and Sihon, king of the Amorites, whom Moses defeated.

(n) Why leap ye, ye high hills? [this is] the hill [which] God desireth to dwell in; yea, the LORD will dwell [in it] for ever.
(n) Why do you boast of your strength and beauty against this Mountain of God.

Why leap ye, ye high hills?.... Meaning the kingdoms of this world that lift up themselves above, and look with contempt upon the interest, kingdom, and church of Christ; lie in wait for it, leap upon it, insult over it, and endeavour to crush and extirpate it; but all in vain; these high hills and mountains are nothing before Zerubbabel King of saints; his church is built on a rock, and the gates of hell cannot prevail against it; the little stone cut out of the mountain without hands will become a great mountain, and fill the whole earth, and break in pieces and consume the kingdoms of it: the word in, the Arabic language, signifies "to lie in wait", as Jarchi from R. Moses Hadarsan observes; and to look out, and leap upon the prey; so R. Hai in Ben Melech says, it has the signification of looking, observing, hoping, or waiting, in the Arable language (k);
this is the hill which God desireth to dwell in; as in Psalm 132:13; the Word of the Lord, as the Targum; the essential Word, the Messiah: his desire was towards his church and people, in eternity, in time, and now is; he has chosen and desired them for his habitation, and in the midst of them he delights to be, Revelation 1:13;
yea, the Lord will dwell in it for ever: he dwells in his church now by his gracious presence; he will dwell in the New Jerusalem church state personally for the space of a thousand years; and after that he will dwell with and among his people to all eternity; see Psalm 132:14.
(k) "Ratzad, insidiatus fuit, uti praedae leo", Golius, col. 991. Castel. col. 3633.

Leap - Why do you triumph and look upon Zion with contempt? He speaks to the hills by an usual figure. Will dwell - This hill, though despicable in your eyes, is precious in God's, and chosen by him for his perpetual residence.