It is narrated from Hazrat Al-Muttalib bin Abdullah bin Hantab that when Hazrat Uthman bin Maz'oon passed away, the Holy Prophet (peace and blessings be upon him) buried him in Jannat al-Baqi', and then said to a person: Go to such-and-such rock and bring a stone so that I may place it as a marker on his grave, by which we may recognize it (later).