Sahih Muslim 6756
صحيح مسلم#6756SahihThere is none born but is created to his true nature (Islam). It is his parents who make him a Jew or a Christian or a Magian quite as beasts produce their young with their limbs perfect. Do you see anything deficient in them? Then he quoted the Qur'an., The nature made by Allah in which He has created men there is no altering of Allah's creation; that is the right religion" (ar-Rum:)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 46:34