This is the third of the Seven Haftarot of Consolation, its calendar position again the reason it accompanies Parashah Re'eh, whose own content sets blessings and curses before Israel and establishes laws on centralized worship, permitted foods and the festival calendar, rather than any direct thematic overlap with Isaiah's vision of a rebuilt, sapphire foundationed city.
This haftarah's closing invitation to come to the water without cost is drawn from the same chapter of Isaiah already read, in an overlapping but not identical portion, as part of the haftarah for Parashah Noach much earlier in the annual cycle, a rare case in this whole batch of the same prophetic material being revisited from a slightly different starting point for a different purpose within the same year.
Where the Noach haftarah used this material to pair with the flood covenant's own permanence, this haftarah uses the immediately following verses, the invitation to water and the everlasting Davidic covenant, purely for their place in the fixed consolation sequence, a reminder that the same prophetic text can serve two entirely different pairing purposes depending on which portion of it a given week's reading actually draws from.