Ibn Isḥāq relates: The Messenger of Allah ﷺ remained in the cave for three nights, Abu Bakr staying with him. When Quraysh discovered his absence they offered a reward of one hundred she-camels to anyone who would return him to them. Once the three nights had passed and the search had slackened, the guide they had hired arrived with their two riding camels and a camel of his own, and Asmāʾ bint Abī Bakr brought them their provisions. She had forgotten to fasten a cord to the food bag; when they were about to depart she wished to hang it up but found no strap, so she removed her waistband, fashioned it into a tie, and suspended the bag from it. Because of this she became known as “the woman of the two waist-bands.”

Ibn Isḥāq continues: When Abu Bakr brought the two mounts to the Messenger of Allah ﷺ he presented the better of them and said, “Ride—may my father and mother be sacrificed for you.”
The Messenger of Allah ﷺ replied, “I will not ride an animal that does not belong to me.”
Abu Bakr said, “Then it is yours, O Messenger of Allah—may my father and mother be sacrificed for you!”
He answered, “No. Tell me the price for which you bought it.”
Abu Bakr named the sum, and the Prophet ﷺ said, “I purchase it for that price.” “It is yours, O Messenger of Allah,” Abu Bakr responded.

Al-Wāqidī, through his chains of transmission, reports that the Prophet ﷺ chose the camel al-Qaṣwāʾ, and that Abu Bakr had bought the two camels for eight hundred dirhams. Ibn ʿAsākir, by way of Abū Usāmah → Hishām → his father → ʿĀʾishah, relates that the camel was al-Jadʿāʾ; al-Suhaylī likewise cites Ibn Isḥāq to that effect. Allah knows best.

Ibn Isḥāq further says: The two of them mounted and set out, Abu Bakr taking his servant ʿĀmir ibn Fuhayrah up behind him to serve them on the road.

Asmāʾ recounted: When the Messenger of Allah ﷺ and Abu Bakr departed, a group from Quraysh—including Abū Jahl—came to us. She related how he struck her on the cheek, knocking an earring from her ear, as mentioned earlier. “We then spent three nights not knowing in which direction the Messenger of Allah ﷺ had gone,” she said, “until a being from the jinn came from the lower part of Mecca, chanting verses in the manner of the Arabs. People followed him, hearing his voice but seeing nothing, until he emerged at the upper end of Mecca, reciting:

‘May Allah, Lord of mankind, bestow the finest reward
on the two companions who alighted by Umm Maʿbad’s tent.
They camped in the open plain and then went on their way—
prosperous is the one who ends his day as Muhammad’s fellow-traveller.’