Abu Wahb says that Sayyiduna 'Adā’ bin Khālid bin Hawdhah said to me: Shall I not read to you the letter which the Messenger of Allah (peace and blessings be upon him) wrote and gave to me? I said: Yes! So he took out a letter in which it was written: This document is regarding what 'Adā’ bin Khālid bin Hawdhah purchased from Muhammad, the Messenger of Allah (peace and blessings be upon him); he bought a slave or a slave-girl from you. There is no deception, evil, or trickery in the mutual trade of the Muslims.