Yahya related to me from Malik from Jafar ibn Muhammad ibn Alifrom his father that Umar ibn al-Khattab mentioned the magians andsaid, "I do not know what to do about them." Abd ar-Rahman ibn Awfsaid, "I bear witness that I heard the Messenger of Allah, may Allahbless him and grant him peace, say, 'Follow the same sunna with themthat you follow with the people of the Book . ' "
USC-MSA web (English) reference: Book 17, Hadith 43
Arabic reference: Book 17, Hadith 619