Sahih Bukhari
Sahih Bukhari Volume 006, Book 060, Hadith Number 051
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 60. Prophetic Commentary on the Qur'an (Tafseer of The Prophet (PBUH))
Narrated By Jabir : Jews used to say: "If one has sexual intercourse with his wife from the back, then she will deliver a squint-eyed child." So this Verse was revealed:
"Your wives are a tilth unto you; so go to your tilth when or how you will." (2.223)