Sunan Ibn Majah, Volume 3, Book 8, Hadith 1815 (DarusSalam) ⓘ
It was narrated from Amr bin: Shu'aib, form his father, that his grandfather said: “The Messenger of Allah only prescribed Zakat on these five things: wheat, barley, dates, raisins and corn.”
حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ، حَدَّثَنَا إِسْمَاعِيلُ بْنُ عَيَّاشٍ، عَنْ مُحَمَّدِ بْنِ عُبَيْدِ اللَّهِ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، قَالَ إِنَّمَا سَنَّ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ الزَّكَاةَ فِي هَذِهِ الْخَمْسَةِ فِي الْحِنْطَةِ وَالشَّعِيرِ وَالتَّمْرِ وَالزَّبِيبِ وَالذُّرَةِ .
also referenced under: Hadith 1815 (Reference) & Book 8, Hadith 33 (In-Book)