The Messenger of Allah ﷺ said, "Every child is born upon the natural disposition. It is his parents who make him a Jew, a Christian, or a Magian, just as an animal gives birth to a whole offspring. Do you find any of them mutilated at birth?"
حدثنا عبد الأعلى عن معمر عن الزهري عن سعيد بن المسيب
أن رسول الله ﷺ قال كل مولود يولد على الفطرة فأبواه يهودانه وينصرانه أو يمجسانه كما تنتج البهيمة بهيمة هل تحسون فيها من جدعاء
Its isnad is sahih. Muslim related it, 2:301, through Zubaydi from Zuhri, with this same isnad, similarly but at greater length. Ibn Hibban related it in his Sahih [no. 1] in our edition, through Abdul-Razzaq from Mamar from Zuhri, also at greater length. It is a well-known hadith transmitted from Abu Hurairah, related from him by more than one of the Followers, in the Sahihayn and other collections. See also 7436-7438. Ibn Hibban also related it through three other isnads, numbers 128, 129, and 133, and we have set out many of its transmission paths in detail there, at 128. See also Ibn Kathir's tafsir, 6:432, and Fath al-Bari, 3:196-200.His saying, "one beast begets another beast" (tantaju al-bahimatu bahimatan), with the first ta having damma and the second having fatha in tantaju, is in the passive voice, where al-bahimah is the subject and bahimatan is the second object. It is said, "the man nataja his she-camel, yantujuha, natjan," meaning he attended to her delivery until she gave birth, acting as a midwife would, receiving the offspring and tending to its condition. So he is called natij, the she-camel is manthujah, and the offspring is natijah. It is a triliteral verb of the pattern daraba. When the verb is attributed to the she-camel herself, it is put in the passive form, so one says, "the she-camel nutijat."Al-jadaa means one whose extremities, or some of them, have been cut off, such as the nose, ear, or lip. Ibn Athir said it applies more specifically to the nose, so that when used without qualification, that is the meaning that predominates.As for his saying, "yuhawwidanihi wa yunassiranihi aw yumajjisanihi" (they make him a Jew and a Christian, or a Zoroastrian), it appears this way with "and" in the first instance and "or" in the second, in the H and M copies, while in the K copy it reads "or make him a Christian," with "or" affirmed in the first instance as well.