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"O you who believe! Turn to Allaah with sincere repentance! It may be that your Lord will remit from you your sins, and admit you into Gardens under which rivers flow (Paradise) the Day that Allaah will not disgrace the Prophet (Muhammad sal-Allaahu 'alayhe wa sallam) and those who believe with him, their Light will run forward before them and with (their Records Books of deeds) in their right hands they will say: "Our Lord! Keep perfect our Light for us [and do not put it off till we cross over the Sirat (a slippery bridge over the Hell) safely] and grant us forgiveness, Verily, You are Able to do all things."" [At-Tahreem (66):8]

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]