Mishkat al-Masabih 6 Zakat كتاب الزكاة 33

وَعَنْ عَتَّابِ بْنِ أَسِيدٍ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ فِي زَكَاةِ الْكُرُومِ: «إِنَّهَا تُخْرَصُ كَمَا تُخْرَصُ النَّخْلُ ثُمَّ تُؤَدَّى زَكَاتُهُ زَبِيبًا كَمَا تُؤَدَّى زَكَاةُ النَّخْلِ تَمْرًا» . رَوَاهُ التِّرْمِذِيّ وَأَبُو دَاوُد

‘Attab b. Usaid reported the Prophet as saying regarding the zakat on vines, “They are to be estimated as palm-trees are, then the zakat is to be paid in raisins as the zakat on palm-trees is paid in dried dates.” Tirmidhi and Abu Dawud transmitted it.