John Trapp on Amos 7:9

Verſe 9. And the high-places of Iſaac ſhall be deſolate] The Edomites alſo came of Iſaac: but by a Synechdoche the Iſraelites only are here and ver. 16. to be underſtood. Like as elſewhere Heber is put for the Iſraelites only Num. 24.24. and Ioſeph, for Ephraim Rev. 7.8. Some think that the high places of Iſaac are here mentioned, to ſhew that they were erected by the people in an apiſh imitation either of Beerſheba where Iſaac worſhipped, or of mount Moriah where Iſaac ſhould have been offered: And that Iſaac is here written with Sin and not tſadi to ſhew that God held himſelf not adored, but derided by thoſe high-places of irriſion, or thoſe ridiculous ultars, which therefore he threateneth to deſolate, and lay waſt.

and I will riſe againſt the houſe of Jeroboam with the ſword] as a prelude to the utter extermination of all by the Aſſyrians. See this fullfilled 2 King. 15.10. and chap. 17. Jeroboam was very proſperous and victorious: yet deſigned to deſtruction. Aug. Mat. 6.30. It is ſaid of wicked men, that foeneâ quadam felicitate temporaliter floreant, they flouriſh to day as graſs, and to morrow are caſt into the oven: and as the mettle whereof men make glaſs is neareſt melting when it ſhineth brighteſt, ſo are graceleſſe perſons neareſt deſtruction, when at greateſt luſtre. The Turks obſerving that few of their Viſiers die in their beds,Grand Sig. Serag. have this proverbe amongſt them, that the greateſt man is but as a ſtatue of glaſſe.