The chapter
In the desert of Banu Sa'd, while the young Muhammad played with the other boys, Jibril came to him, took hold of him, and laid him down. Anas ibn Malik transmits the event in Sahih Muslim with surgical calm: he split open his chest, took out the heart, extracted from it a clot, and said: "This is Shaytan's portion of you." Then he washed the heart in a basin of gold with the water of Zamzam, restored it, and returned him to his place. The boys ran to Halimah crying that Muhammad had been killed; they received him back "with an altered color." Anas adds the detail of an eyewitness generation: "I used to see the mark of that stitching on his chest."
The tradition records the operation was not unique. Before the Night Journey, the opening was repeated: the chest washed and the heart filled with wisdom and faith before the ascent through the heavens. The pattern is deliberate, purification precedes commission. Before the boy could carry the message, the organ that would carry it was cleansed of the whisperer's share; before the man could stand in the highest presence, it was cleansed again.
The Codex reads this node beside the hadith of the qarin: every human being has a companion from the jinn assigned to him: "even me," the Prophet ﷺ said, "but Allah helped me against him, and he submitted, so he commands me with nothing but good." The washing of the chest and the submission of the qarin are two faces of one fact: the vessel of revelation was secured at every layer, flesh, heart, and unseen company.
Halimah, shaken, returned the boy to Aminah. The desert years had already done their work: pure language, hard sky, open horizon, and a heart washed with the water that sprang for his ancestor Isma'il. Nothing about the final Prophet was improvised.