Amos 6:12

“Shall horses run upon the rocks? or will [one] plough [there] with oxen? etc.] Will any man be so weak and foolish, to propose or attempt a race for horses upon rocks, where they and their riders would be in danger of breaking their necks? or would any man act so unwise a part, as to take a yoke of oxen to plough with them upon a rock, where no impression can be made? as vain and fruitless a thing it would be to attempt to bring such persons under a conviction of their sins, and to repentance for them, and reformation from them, who are given up to a judicial hardness of heart, like that of a rock, as are the persons described in the next clause; or as such methods with horses and oxen would…”

“In turning "judgment (justice) into gall (poison), and . . . righteousness into hemlock" (or wormwood, bitter and noxious), ye act as perversely as if one were to make "horses run upon the rock" or to "plough with oxen there" [MAURER]. As horses and oxen are useless on a rock, so ye are incapable of fulfilling justice [GROTIUS]. Ye impede the course of God's benefits, because ye are as it were a hard rock on which His favor cannot run. "Those that will not be tilled as fields, shall be abandoned as rocks" [CALVIN].”

“The two images both represent a toil, which people would condemn as absurd, destructive, as well as fruitless. The horse’s hoofs or his limbs would be broken; the plowing-gear would be destroyed. The prophet gains the attention by the question. What then? they ask. The answer is implied by the for, which follows. Ye are they, who are so doing. As absurd is it to seek gain from injustice and oppression, to which God had annexed loss and woe, temporal and eternal. More easy to change the course of nature or the use of things of nature, than the course of God’s Providence or the laws of His just retribution. They had changed the sweet laws of “justice” and equity “into” the “gall” of…”

“Shall horses - If prophets exhort or advise, it does no more good than if you would run your horses upon the precipices of rocks. Amos 6:13”

“6:12 It would be foolish to run horses . . . over boulders, because unshod horses cannot run on rocks without serious damage to their hooves. It is also obvious that oxen cannot plow rocks. A slight adjustment to the word division of the Hebrew text yields plow the sea with oxen, an equally absurd suggestion. • that’s how foolish you are: The point of the comparisons now becomes obvious, as Israel’s own absurdity surfaces in the moral realm. • you turn justice into poison: The people perverted what is just and right, turning it into something toxic and bitter (see also 5:7).”

“horses: Isa 48:4; Jer 5:3, Jer 6:29, Jer 6:30; Zac 7:11, Zac 7:12 for: Amo 5:7, Amo 5:11, Amo 5:12; Kg1 21:7-13; Psa 94:20, Psa 94:21; Isa 59:13, Isa 59:14; Hos 10:4, Hos 10:13; Mic 7:3; Hab 1:3, Hab 1:4; Act 7:51, Act 7:52 Amos 6:13”

“This judgment also, they, with their perversion of all right, will be unable to avert by their foolish trust in their own power. Amo 6:12. "Do horses indeed run upon the rock, or do men plough (there) with oxen, that ye turn justice into poison, and the fruit of the righteousness into wormwood? Amo 6:13. They who rejoice over what is worthless, who say: with our strength we make ourselves horns! Amo 6:14. For, behold, I raise over you, O house of Israel, is the saying of Jehovah, the God of hosts, a nation; and they will oppress you from the territory of Hamath to the brook of the desert." To explain the threat in Amo 6:11, Amos now calls attention in Amo 6:12, under two different similes,…”