It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) had two (freed) slaves: one an Abyssinian and the other a Copt. One day the two of them insulted each other while the Prophet (peace and blessings be upon him) was listening. One of them said to the other: "O Abyssinian!" and the other said: "O Copt!" So the Prophet (peace and blessings be upon him) said: "Do not say this, for you are both members of the household of Muhammad (peace and blessings be upon him)."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Mu'awiyah bin Qurrah (may Allah have mercy on him) except Yazid bin Abi Ziyad (may Allah have mercy on him), no one narrated it from Yazid (may Allah have mercy on him) except Abu Hafs al-Abbar (may Allah have mercy on him), and Mansur bin Abi Muzahim (may Allah have mercy on him) is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 8210
Hadith Gradingمحدثین:إسناده حسن، فيه يزيد بن أبي زياد
Hadith Takhrij«قال الهيثمي: في إسنادهما يزيد بن أبي زياد وهو على ضعفه حسن الحديث «مجمع الزوائد ومنبع الفوائد، ج 8، ص 86»» «أخرجه أبو يعلى فى «مسنده» برقم: 4146، وابن حجر فى «المطالب العالية» برقم: 2553، 2735، والطبراني فى «الصغير» برقم: 573»