Passage
and from Mattanah to Nahaliel; and from Nahaliel to Bamoth;
and from Mattanah to Nahaliel; and from Nahaliel to Bamoth;
Numbers 21:17 Then sang Israel this song: Spring up, O well; sing ye unto it:
Numbers 21:18 The well, which the princes digged, Which the nobles of the people delved, With the sceptre, [and] with their staves. And from the wilderness [they journeyed] to Mattanah;
Numbers 21:19 and from Mattanah to Nahaliel; and from Nahaliel to Bamoth;
Numbers 21:20 and from Bamoth to the valley that is in the field of Moab, to the top of Pisgah, which looketh down upon the desert.
Numbers 21:21 And Israel sent messengers unto Sihon king of the Amorites, saying,
The verse centers on "mattanah", "nahaliel", and "bamoth". It is saying that the verse draws attention to "mattanah" and "nahaliel", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 18's "The well which the princes digged Which..." into verse 20's "and from Bamoth to the valley that...", so "mattanah" and "nahaliel" 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 "mattanah" and "nahaliel" with trust shaped by these words, not by a vague optimism outside the passage.