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.' "
Muwatta Malik Book 36, Hadith 46