Musannaf Ibn Abi Shaybah

Hazrat Ibn Jurayj states that I heard from Hazrat Ibn Abi Najih, who says that Hazrat Umar bin Abdul Aziz wrote regarding the zakat of dates: The zakat of Barni dates (a special type of date) should be paid from Barni dates, and the zakat of Lawn dates (a special type of date) should be paid from the same dates. Barni dates will not be collected for the zakat of Lawn dates.