It is narrated from Sayyiduna Uqbah bin Amir (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "These lineages of yours are not a means of reviling anyone. You are all the children of Adam, and you are all equal, like a sa' of the same measure when it is filled. No one has any superiority over anyone except by religion or righteous deeds. It is enough evil for a man that he be obscene, foul-tongued, miserly and given to swearing oaths frequently."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14886