Numbers 24:21

He saw the Keinite. Because the Keinite was encamped near Amalek, as in the incident of which it is said, “Shaul said to the Keinite, etc.,” he mentioned him after Amalek. He gazed at the greatness of Yisro’s descendants, of whom it is said, ”Tirasites, Shimasites, Sochasites.”

How powerful is your dwelling place. I wonder how you merited this. Were you not with me in counseling “come, let us deal shrewdly with them”? Yet now you have settled yourself in the power and strength of Israel.

And he looked upon Jethro, who had been made proselyte, and took up the parable of his prophecy, and said: How strong is thy habitation, who hast set thy dwelling in the clefts of the rocks!

And the meaning of the verse, And ‘he saw’ the Kenite is also that Balaam [actually] saw their land, for he [the Kenite] dwelt with Amalek. And he took up his parable, and said to them by way of counsel, Firm is thy dwelling-place, and thou puttest thy nest in a rock, meaning: “Make thy dwelling in a firm place, and [set] thy nest in a rock, that is, depart and go away from the Amalekites, lest thou be swept away with them, and put in a firm rock thy dwelling, with Israel,” just as it is said, And the children of the Kenite, Moses’ father-in-law, went up out of the city of palm-trees with the children of Judah etc. And Balaam continued: For if the Kenite will be wasted, meaning to say: “Do not be afraid of coming [to settle] in Israel, because even if you will be wasted together with them, because when the enemy will exile Israel they will destroy all inhabitants from the Land, — ‘ad mah’ (for how long) will Ashur [Assyria] carry thee away captive? He will not hold you captive forever, because you shall be redeemed from his hand together with Israel, but if you will remain with the Amalekites, your end will be to perish with them forever.” Similarly we find [this usage of ad mah in the following verses]: ‘ad mah’ O Eternal, wilt Thou be angry forever?; ‘ad meh’ shall my glory be put to shame?, 4:3. — which [in both cases] means “for how long.” Or [it may be that the phrase ad mah] comes to emphasize the magnitude of something, such as: ‘mah’(how) weak is thy heart!; ‘mah’(how)was thy mother a lioness!, 19:2. and [here it means] to say: “To what extent can the captivity which Assyria will take captive of you reach, and how great [can it be]? It should be of no significance at all to you, because you will not [ultimately] be destroyed, as you would be if you were together with Amalek.” Therefore Balaam continued and took up his parable about Assyria, [saying] that the time of his own land will come for him too, and nobody will be saved from the great and terrible day of the Eternal [which will come] upon all the nations; for ships shall come from the coast of Kittim, which refers to the Romans, and they shall afflict [the] Ashur [who is] mentioned [later on in that verse], and shall afflict Eber, which means Israel. He is thus …

איתן מושבך, you imagined that your seat of power was inviolate, unconquerable as the rock of Gibraltar. It will turn out to be different from what you thought, but יהיה לבער קין, Kayin will be consumed, by the time the Kingdom of Assyria will emerge you will be taken prisoner, and will go into exile.