Passage
For a fire is gone out of Heshbon, A flame from the city of Sihon: It hath devoured Ar of Moab, The lords of the high places of the Arnon.
For a fire is gone out of Heshbon, A flame from the city of Sihon: It hath devoured Ar of Moab, The lords of the high places of the Arnon.
Numbers 21:26 For Heshbon was the city of Sihon the king of the Amorites, who had fought against the former king of Moab, and taken all his land out of his hand, even unto the Arnon.
Numbers 21:27 Wherefore they that speak in proverbs say, Come ye to Heshbon; Let the city of Sihon be built and established:
Numbers 21:28 For a fire is gone out of Heshbon, A flame from the city of Sihon: It hath devoured Ar of Moab, The lords of the high places of the Arnon.
Numbers 21:29 Woe to thee, Moab! Thou art undone, O people of Chemosh: He hath given his sons as fugitives, And his daughters into captivity, Unto Sihon king of the Amorites.
Numbers 21:30 We have shot at them; Heshbon is perished even unto Dibon, And we have laid waste even unto Nophah, Which [reacheth] unto Medeba.
The verse centers on "fire", "gone", "heshbon", "flame", "city", "sihon", "hath", and "devoured". It is saying that the verse draws attention to "fire" and "gone", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 27's "Wherefore they that speak in proverbs say..." into verse 29's "Woe to thee Moab Thou art undone...", so "fire" and "gone" 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 "fire" and "gone" with trust shaped by these words, not by a vague optimism outside the passage.