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"And their Prophet (Samuel) said to them, "Indeed Allaah has appointed Talut (Saul) as a king over you." They said, "How can he be a king over us when we are better fitted than him for the kingdom, and he has not been given enough wealth." He said: "Verily, Allaah has chosen him above you and has increased him abundantly in knowledge and stature, And Allaah grants His Kingdom to whom He wills, And Allaah is All-Sufficient for His creatures' needs, All-Knower."" [Al-Baqarah (2):247]

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]