A history of racism among sahaba
Once Aboo Dharr and Bilaal had a dispute, but in a moment of anger Aboo Dharr said: “O Son of a black woman!”
This came to the attention of the Prophet ﷺ who said: “O Aboo Dharr, did you slander his mother? You are a man in whom there is still some ignorance!”
Aboo Dahrr left the mosque with tears streaming from his eyes and went to Bilaal.
When he saw Bilaal he placed his cheek on the ground and said: “I will not get up until you place your foot over my face. You are the noble and I am the lowly!”
Bilaal began to cry: he approached Aboo Dharr, stood him up and kissed him on that very cheek. Then they hugged each other and cried together.
● [شعب الإيمان للبيهقي ٤٧٦٠، صحيح البخاري ٥٠، صحيح مسلم ١٦٦١]