Maliks Muwatta Book 36, Hadith Number 35.

Section : Judgement on Division of Properties.

Yahya related to me from Malik that Thawr ibn Zayd ad-Dili said, “I heard that the Messenger of Allah, may Allah bless him and grant him peace, said, ‘A house or land that has been divided in the Jahiliyya, it is according to the division of the Jahiliyya. A house or land which has not been divided before the coming of Islam is divided according to Islam.'”