Narrated Jabir:
"The Jews would say: "Whoever goes into his wife's vagina from behind her, then his children will be cross-eyed.' So Allah revealed: Your wives are a tilth for your, so go to your tilth when or how you will (2:223)."
English reference: Vol. 5, Book 44, Hadith 2978
Arabic reference: Book 47, Hadith 3245