Amr bin Maymun (may Allah have mercy on him) said: My father narrated to me that Sayyiduna Bilal (may Allah be pleased with him) had a brother who used to trace his lineage to the Arabs and considered himself one of them. He proposed marriage to an Arab woman. They said: If Sayyiduna Bilal (may Allah be pleased with him) comes, we will marry you (to her). Sayyiduna Bilal (may Allah be pleased with him) came and said: I am Bilal bin Rabah, and this is my brother, who is bad in religion and character. If you wish, marry him and give her to him in marriage; and if you wish to leave him, then leave him. They said: Whoever you are the brother of, we will marry him (to our woman). So they married him.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13788