The chapter
Somewhere in the geography of the Day stands a body of water with the most beloved specifications in the tradition, because he ﷺ described it personally, repeatedly, like a man describing a homecoming: "My Basin is a month's journey across. Its water is whiter than milk, its scent finer than musk, its drinking-vessels like the stars of the sky, and whoever drinks from it will never thirst again."
Its source is the Day's own plumbing of mercy: two spouts feed it from al-Kawthar, the river granted in the shortest surah of the Qur'an, revealed, with perfect timing, when Makkah was calling him ﷺ "cut off," childless, futureless: "Indeed, We have granted you al-Kawthar, the abundance." History's answer to that taunt is a basin the width of a month, serving a nation of every century, with the taunters absent.
He ﷺ stands at it in person: "I am your forerunner to the Basin", farat, the rider sent ahead of the caravan to prepare the water. The reunion protocol is on record: "You will come to me with radiant faces and radiant limbs from the traces of wudu, a marking no other nation carries." The ummah is recognized at the water by its ablutions: fourteen centuries of bathroom sinks and cold mornings, suddenly legible as the Day's identification system.
And then the tradition's most sobering scene, which the Codex refuses to soften because the Sahihayn refused: men will be pulled away from the water before his eyes. "I will say: my companions, my companions! And it will be said: you do not know what they innovated after you. And I will say: away, away, with whoever changed after me." The Basin has a gatekeeper, and the gatekeeper's criterion is fidelity to the way, not names, claims, or proximity. No sentence in the traditions of the End argues more precisely for leaving the religion as he ﷺ left it.
The scholars' map of the Day places the Basin twice, and the Codex notes the survey honestly: its great station is in the plain before the Sirat, mercy before the crossing, with reports of a second serving at the far side, by the gate. Either way, its function in the sequence is the same and is the reason this tile exists: between the sun at a mile and the opened ledgers, the Day of maximum thirst contains an announced, named, month-wide act of hospitality, hosted by the one man who spent the Day interceding, now pouring water for his guests.
One drink ends thirst forever. The Path's remaining nodes hold no scene gentler than this one until the Garden's own gates.