Passage
For Heshbon was the citie of Sihon the king of the Amorites, which had fought beforetime against the king of the Moabites, and had taken al his land out of his hand, euen vnto Arnon.
For Heshbon was the citie of Sihon the king of the Amorites, which had fought beforetime against the king of the Moabites, and had taken al his land out of his hand, euen vnto Arnon.
Numbers 21:24 But Israel smote him with the edge of the sword, and conquered his land, from Arnon vnto Iabok, euen vnto ye children of Ammon: for the border of the children of Ammon was strong.
Numbers 21:25 And Israel tooke al these cities, and dwelt in all the cities of the Amorites in Heshbon and in all the villages thereof.
Numbers 21:26 For Heshbon was the citie of Sihon the king of the Amorites, which had fought beforetime against the king of the Moabites, and had taken al his land out of his hand, euen vnto Arnon.
Numbers 21:27 Wherefore they that speake in prouerbes, say, Come to Heshbon, let the citie of Sihon bee built and repaired:
Numbers 21:28 For a fire is gone out of Heshbon, and a flame from the citie of Sihon, and hath consumed Ar of the Moabites, and the lords of Bamoth in Arnon.
The verse centers on "heshbon", "citie", "sihon", "king", "amorites", "fought", "beforetime", and "against". It is saying that the verse draws attention to "heshbon" and "citie", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 25's "And Israel tooke al these cities and..." into verse 27's "Wherefore they that speake in prouerbes say...", so "heshbon" and "citie" belong inside that flow. In Numbers context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "heshbon" and "citie" with trust shaped by these words, not by a vague optimism outside the passage.