Hadith 578
امر رسول الله صلى الله عليه وسلم ان يخرص العنب كما يخرص النخل و توخذ زكاته زبيبا كما تؤخذ صدقة النخل تمرا
"The Messenger of Allah (peace and blessings be upon him) ordered that grapes should be estimated in the same manner as dates are estimated, and their zakat should be collected in the form of dried raisins just as the zakat of dates is taken in the form of dried dates (i.e., chuwara)."
