ACCOUNT OF THE DESPATCH OF EPISTLES BY THEAPOSTLE OF ALLAH, MAY ALLAH BLESS HIM, TO THECHIEFS, INVITING THEM TO JOIN THE FOLD OF ISLAM,AND WHAT THE APOSTLE OF ALLAH, MAY ALLAHBLESS HIM, WROTE TO THE PEOPLE OF ARABIA ANDOTHERS-11

He (Ibn Sa’d) said: All Ibn Muhammad informed us on the authority of Said Ibn Abi 'Arubah, he on the authority of Qatadah, he on the authority of a man of Banu Sadus, he said: The Apostle of Allah, may Allah bless him, wrote to Bakr Ibn Wa'il: After that, embrace Islam and you will be safe. Qatedah said: They did not find a person to read it till a man of Banu Dubay'ah Ibn Rabiah
came to them. He read it and they (Banu Dubay’ah) came to be called
Banu al-Katib. The person who had received the epistle of the Apostle of
Allah, may Allah bless him, was Zabyan Ibn Marthad al-Sadusi.