Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with him) narrates: He said, "O Messenger of Allah (peace and blessings be upon him)! We hear some ahadith from you, so will you permit us to write them down?" The Prophet (peace and blessings be upon him) said, "Yes." This was at the time when the Prophet (peace and blessings be upon him) first sent a letter to the people of Makkah (in which it was written): "It is not permissible to stipulate two conditions in one transaction, and it is not permissible to combine a sale and a loan in one transaction, and it is also not permissible to make a transaction in which there is no guarantee. And whoever becomes a mukatab (contracted slave) for one hundred dirhams and pays all except ten dirhams, he will be considered a slave. Or if someone made a contract of manumission for one hundred uqiyyah and pays all except one uqiyyah, then that person will be considered a slave."