Sahih Bukhari
Laws of Inheritance (Al-Faraaid)
Volume: 008 / Book Number: 080 / Hadith Number: 724
Narrated Ibn 'Abbas:
The Prophet said, "Give the Fara'id (the shares of the inheritance that are prescribed in the Qur'an) to those who are entitled to receive it. Then whatever remains, should be given to the closest male relative of the deceased ."