Passage
Woe to thee, Moab! thou art undone, O people of Chemosh: he hath given his sons that escaped, and his daughters, into captivity unto Sihon king of the Amorites.
Woe to thee, Moab! thou art undone, O people of Chemosh: he hath given his sons that escaped, and his daughters, into captivity unto Sihon king of the Amorites.
Numbers 21:27 Wherefore they that speak in proverbs say, Come into Heshbon, let the city of Sihon be built and prepared:
Numbers 21:28 For there is a fire gone out of Heshbon, a flame from the city of Sihon: it hath consumed Ar of Moab, and the lords of the high places of Arnon.
Numbers 21:29 Woe to thee, Moab! thou art undone, O people of Chemosh: he hath given his sons that escaped, 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 them waste even unto Nophah, which reacheth unto Medeba.
Numbers 21:31 Thus Israel dwelt in the land of the Amorites.
The verse centers on "thee", "moab", "thou", "undone", "people", "chemosh", "hath", and "given". It is saying that the verse draws attention to "thee" and "moab", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 28's "For there is a fire gone out..." into verse 30's "We have shot at them Heshbon is...", so "thee" and "moab" 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 "thee" and "moab" with trust shaped by these words, not by a vague optimism outside the passage.