It is narrated from Hazrat Abu Saeed Khudri (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: There is no zakat on wheat or dates less than five wasq.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 11931
Hadith Gradingحکم دارالسلام:إسناد صحيح وانظر ما قبله