Muhammad meets the monk Bahira. From Jami' al-Tawarikh ("The Universal History") c. 1315.
The story of Muhammad's encounter with Bahira is found in the works of the early Muslim historians Ibn Hisham, Ibn Sa'd al-Baghdadi, and Muhammad ibn Jarir al-Tabari, whose versions differ in some details. When Muhammad was either nine or twelve years old, he met Bahira in the town of Bosra in Syria during his travel with a Meccancaravan, accompanying his uncle Abu Talib ibn ‘Abd al-Muttalib. When the caravan was passing by his cell, the monk invited the merchants to a feast. They accepted the invitation, leaving the boy to guard the camel. Bahira, however, insisted that everyone in the caravan should come to him. Then a miraculous occurrence indicated to the monk that Muhammad was to become a prophet.
It was a miraculous movement of a cloud that kept shadowing Muhammad regardless of the time of the day. The monk revealed his visions of Muhammad's future to the boy's uncle (Abu Talib), warning him to preserve the child from the Jews (in Ibn Sa'd's version) or from the Byzantines (in al-Tabari's version). Both Ibn Sa'd and al-Tabari write that Bahira found the announcement of the coming of Muhammad in the original, unadulterated gospels, which he possessed; the standard Islamic view is that Christians corrupted the gospels, in part by erasing any references to Muhammad.
Maulana Muhammad Ali (2002), The Holy Qur'an: Arabic Text with English Translation and Commentary, New Addition, Ahmadiyya Anjuman Isha’ at Islam Lahore Inc., Ohio, USA.
Osman Kartal (2009), The Prophet’s Scribe Athena Press, London (a novel)
B. Roggema, The Legend of Sergius Baḥīrā. Eastern Christian Apologetics and Apocalyptic in Response to Islam (The History of Christian-Muslim Relations. Texts and Studies 9; 2008) (includes editions, translations and further references).