Reconstructing Kabah: In about 605 A.D., when the Holy Prophet was 35 years old, a flood swept Mecca and the building of the Ka'bah was badly damaged. The Quraish decided to rebuild it. When the walls reached a certain height, a dispute arose between various clans as to whom should the honor of placing the Black Stone (Hajar Aswad) in its place go. This dispute threatened to assume serious proportions but, at last, it was agreed upon that the first person to enter the precincts of the Ka'bah the next morning should arbitrate this issue.
It so happened, that first person was none other than Muhammad (s.a.w.a.). The Quraish were pleased with the turn of the events because Muhammad was well recognized as the Truthful and Trust-worthy personality.
Muhammad (s.a.w.a.) put his own robe on the ground and put the Black Stone on it. He told the disputing clans to send one representative each to hold the corners of the robe and to raise it. When the robe was raised to the required level, he took hold of the Stone and put it in its place. This was a judgement, which settled the dispute to the satisfaction of all the parties.
At this time, he had entered into several business partnerships and always acted with great integrity in his dealings with his partners. 'Abdullah, son of Abu Hamza, narrates that he had entered into a transaction with Muhammad (s.a.w.a.). Its details had yet to be finalized when he had suddenly to leave promising that he would return soon. When, after three days, he went again to the spot, he found Muhammad (s.a.w.a.) waiting for him. Muhammad (s.a.w.a.) did not remonstrate with him. He just said that he had been there for all those three days waiting for him. Saib and Qays, who also had business transactions with him, testify to his exemplary dealings. People were so impressed by his uprightness and integrity, by the purity of his life, his unflinching fidelity, and his strict sense of duty that they called him "al-Amin," the trusted one.