Sahih Bukhari
Laws of Inheritance (Al-Faraaid)
Volume: 008 / Book Number: 080 / Hadith Number: 727
Narrated Ibn 'Abbas:
Allah's Apostle said, "Give the Fara'id (shares prescribed in the Qur'an) to those who are entitled to receive it; and whatever remains, should be given to the closest male relative of the deceased.'