When they reached the Christians...
When they reached the Christians, Abu Haritha asked, “Who are these people with him?” He was told, “The one walking in front is the cousin of Muhammad and the husband of his daughter and his most favorite person in the world’ and the two boys are the sons of this man; and the one walking behind, is his daughter, Fatima, the most beloved person for him in the world.” Thus His Eminence came forward and sat down to participate in the Mubahila ceremony.
On the other hand Sayyid and Aqib took their boys and wanted to proceed for the ceremony. Abu Haritha said, “Muhammad, is sitting in the style of prophets when they sit down for debates.” So they turned back from there and did not dare to take part in the Mubahila ceremony, Sayyid asked, “Where are you going?” Abu Haritha said, “If they had not been on truth he would not have dared us for this Mubahila ceremony.
If they have Mubahila with us, the year will not pass that there will not remain and single Christian on the face of the earth.” According to another report he said, “I am seeing such faces, that if they pray to the Almighty Allah to move the mountain from its place, Allah will indeed do so.
Therefore, do not participate in this Mubahila as you will be destroyed and not a single Christian will remain on the earth.” After that Abu Haritha came to the Holy Prophet (S) and said, “O Abal Qasim, refrain from Mubahila and sign a treaty with us with conditions that we can fulfill.” So they made peace with the Prophet with the condition that every year they will pay the Messenger of Allah (S) 2000 robes, each worth 40 dirhams and if there is a battle, they will give 30 coats of mail, 30 spears and lend 30 horses.
After that His Eminence put the treaty in writing for them and returned from there. The Holy Prophet (S) said, “By the One in Whose hands is my life, destruction come upon them, if they had gone ahead in Mubahila, all of them would have been transmogrified into monkeys and pigs. And indeed this whole valley would have been filled with fire and all of them would have been reduced to ashes.
The Almighty Allah would have destroyed the Christians of Najran so thoroughly that not even a bird would have survived on their trees and before the end of the year, all the Christians would have become extinct. Thus Sayyid and Aqib returned from there and back to the Messenger of Allah (S) after a few days and embraced Islam.