This incident was when our Beloved Prophet of Allah SAW was 12 years old (1459 hijri years ago). The tree which shaded Rasoolullahi SAW is miraculously preserved by Allah for all this long period. It is the lonely tree available for around hundred square kilometers in that inhospitable desert north of Jordan.
There was a priest by the name of Bahira who lived in a small monastery that was close to the market of Busra. The Wise Bahira had witnessed some peculiarities in the procession that he had not seen before. While he was looking at the Qurayshi procession, he had noticed a cloud shading a child (Muhammad SAW). When the procession came and lodged underneath a tree, he observed the same cloud shading the tree and the tree's branches bending before the Radiant Child to provide shade for him. Bahira, who had seen these peculiarities, invited them for a meal.
They accepted the invitation and sat at the dinner table. However, there was an individual from the procession who was absent. Bahira was looking for Muhammad SAW. Since he was the youngest, the Radiant Child had been charged with the duty of keeping an eye on the procession's belongings; thus, he was sitting by the tree. Bahira, who had examined the Holy Books and learned the characteristics and signs of the last Prophet from them, insisted that he come as well.
While Muhammad SAW was busy eating his meal at the table, Bahira's entire attention and amazement was on him. He was eying his every move and condition. Bahira had found what he was looking for and had reached his goal. The Radiant Child's behavior and every action perfectly matched the written descriptions in the book next to him. The meal was finished and while everyone was dispersing from the table, Bahira leaned down to Muhammad SAW ear and said, "Look, young man. I want you to answer the questions that I am going to ask you about Lat and Uzza." There was an expression of discomfort and hate in the Radiant Child's eyes, "Please do not want anything from me on behalf of Lat and Uzza. By God, there is nothing that I hate more than them". Bahira retracted his first request. "In that case, Answer the questions I am going to ask you for the sake of Allah". Muhammad SAW replied "Ask whatever you wish". Bahira was bewildered by all the answers that he received to his questions because they exactly matched everything that he knew about the Last Prophet. Lastly, he looked at Muhammad's back and saw the seal of Prophethood. Bahira's conviction was now certain and without doubt: This youth was the long-awaited Last Prophet SAW. After his recognition, Bahira went to our Holy Prophet's uncle, Abu Talib. The following conversation took place between the two:
"What relation do you have to this child?"
"He is my son"
"No, he is not your son because this child's father is not supposed to be living."
"Yes, you are correct. He is my nephew, not my biological son".
"Well, what happened to his father?
"He passed away while this child's mother was pregnant."
"Yes, you have told the truth."
Finally, Bahira gave the following advice to our Holy Prophet's uncle, which showed that he was a man who thought and spoke rightfully: "Immediately take your nephew back to your homeland. Protect him from the jealous Jews. By God, if the Jews see this child and notice what I have noticed, then they will try to inflict harm upon him because your nephew is going to attain a great reputation and glory in the future. Do not stay here anymore. Be sure to take him back immediately." Upon hearing this advice, Abu Talib sold his goods there and returned to Mecca together with his glorious nephew.
For more info salafiaqeedah.blogspot.com/2010/12/only-living-sahabi-tree.html