It is narrated from Sayyiduna Anas (may Allah be pleased with him), (the narrator says:) I think he narrated it from the Prophet (peace and blessings be upon him), that he (peace and blessings be upon him) said: "The children of the polytheists will be the servants of the people of Paradise."
Imam al-Tabarani (may Allah have mercy on him) said: "Only al-Hurr bin Malik narrated this hadith from Mubarak bin Fadalah."
Hadith Referenceالمعجم الأوسط / باب الميم / 5355
Hadith Takhrij«أخرجه الطيالسي فى «مسنده» برقم: 2225، وأبو يعلى فى «مسنده» برقم: 4090، والبزار فى «مسنده» برقم: 7467، 7466، والطبراني فى «الأوسط» برقم: 2972»