First Evidence: Abu Zarr of the Ghifar tribe somehow got angry with the freed slave of Abu Bakr, Bilal of Abyssinia. Both of them were the companions of the Prophet. The altercation became prolonged and Abu Zarr in his fury called Bilal the son of a black skinned mother. Bilal complained to the Prophet, who addressed Abu Zarr saying, "Did you call him a name reviling his mother? It appears you still retain vestiges of Jahiliyah (ignorance period before Islam)" Abu Zarr failed to understand the word Jahiliyah and took it to signify some sort of sexual immorality, and meekly questioned in surprise, "At this ripe age, O Prophet of God?" The Prophet said in reply, "Yes, you are his brother (and should be considerate and kind to him)". Abu Zarr who had by now understood the significance of the Prophet's remark, was ashamed and repentant and out of extreme repentance and humility requested Bilal to trample his face with his feet. Second Evidenc...
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