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"They (the Jews, Quraish pagans, idolaters, etc.) did not estimate Allaah with an estimation due to Him when they said: "Nothing did Allaah send down to any human being (by inspiration)." Say (O Muhammad sal-Allaahu 'alayhe wa sallam): "Who then sent down the Book which Moosaa (Moses) brought, a light and a guidance to mankind which you (the Jews) have made into (separate) papersheets, disclosing (some of it) and concealing (much), And you (believers in Allaah and His Messenger Muhammad sal-Allaahu 'alayhe wa sallam), were taught (through the Qur'aan) that which neither you nor your fathers knew." Say: "Allaah (sent it down)." Then leave them to play in their vain discussions." [Al-An'aam (6):91]

Narrated Al-Ma'rur:

At Ar-Rabadha I met Abu Dhar who was wearing a cloak, and his slave, too, was wearing a similar one. I asked about the reason for it. He replied, "I abused a person by calling his mother with bad names." The Prophet said to me, 'O Abu Dhar! Did you abuse him by calling his mother with bad names You still have some characteristics of ignorance. Your slaves are your brothers and Allah has put them under your command. So whoever has a brother under his command should feed him of what he eats and dress him of what he wears. Do not ask them (slaves) to do things beyond their capacity (power) and if you do so, then help them.' " [The Book of Faith Volume 1, Book 2, Hadeeth 29]