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In the name of Allah the Compassionate, the Merciful
Whoever from the tribe of Juhaina accepts Islam, says prayers, pays the Zakat, remains subservient to Allah and his Prophet (S.A.W.) and keeps on paying Khums out of the gains of war and declares his acceptance of Islam and keeps aloof from the infidels; he is in the protection of Allah and His Prophet (S.A.W.).
As regards the pawned property; of the payable loans, only the amount of the principal shall be payable, after (the debtor’s) conversion to Islam. Interests on the pawned amount shall stand cancelled. As Zakat on fruit — one tenth of the produce, shall be payable. Whoever joins these people shall have the same rights and the same terms shall apply to him..
SEAL : ALLAH’S PROPHET MUHAMMAD
Note: When after sometime, most of the people of the tribe accepted Islam, the Holy Prophet (S.A.W.) issued an injunction to these people, mentioning their duties.
http://lettersofprophetmuhammad.wordpress.com/