When the Messenger of Allah ﷺ sent the two of them to Yemen to teach the people the matters of their religion, he instructed them, "Do not take the zakat except from these four crops, barley, wheat, Zabib, and dates."
حين بعثهما رسول الله ﷺ إلى اليمن يعلمان الناس أمر دينهم: لا تأخذوا الصدقة إلا من هذه الأربعة: الشعير، والحنطة، والزبيب، والتمر.
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Daraqutni (1921), Hakim (1/401), and Bayhaqi (4/125) all narrated it from the hadith of Abu Huzaifa, who said, We were told by Sufyan, from Talha bin Yahya, from Abu Burda, from Abu Musa and Muaz bin Jabal, and they mentioned it. Bayhaqi said, "Its narrators are trustworthy and it is connected." Hakim graded it sahih.I say, its chain is hasan because of the discussion surrounding Abu Huzaifa, who is Musa bin Masud Nahdi, and Talha bin Yahya Taymi, except that both of them graded the hadith hasan. This hadith agrees with the hadith of Musa bin Talha concerning the taking of charity from these four items.As for what was narrated from Muaz, that he wrote to the Prophet ﷺ asking him about vegetables, meaning legumes, and he said, "There is nothing due on them," this is daif. Tirmidhi (638) narrated it from Ali bin Khashram, who said, We were told by Isa bin Yunus, from Hasan bin Umara, from Muhammad bin Abdul-Rahman bin Ubayd, from Isa bin Talha, from Muaz, and he mentioned it.Tirmidhi said, "The chain of this hadith is not sahih. Nothing sahih has been established on this subject from the Prophet ﷺ. This is only narrated from Musa bin Talha, from the Prophet ﷺ, as a mursal report, and the practice among the scholars is based on this, that there is no charity due on vegetables." He also said, "Hasan here is Ibn Umara, and he is daif according to the scholars of hadith. Shuba and others declared him daif, and Ibn Mubarak abandoned him." This ends Tirmidhi's statement.Bayhaqi mentioned in Sunan al-Kubra (4/129) the mursal reports of Hasan, Shaybi, Mujahid, and others, and said, "All these hadiths are mursal, but they come through different routes, so some of them reinforce others, and alongside them is the narration of Abu Burda from Abu Musa, and the statement of some of the companions." End of quote.On this subject there is also what was narrated from Musa bin Talha, from his father Talha bin Ubaydullah Taymi, who said, The Messenger of Allah ﷺ said, "There is no charity due on vegetables." Tabarani narrated it in Awsat (Majma Bahrayn (1350)), and Bazzar (Kashf Astar 885), both from Abu Kamil Jahdari, who said, We were told by Harith bin Nabhan, who said, We were told by Ata bin Saaib, from Musa bin Talha, from his father, and he mentioned it.Bazzar said, We do not know of anyone who traced this connected chain except Harith, and Ata did not narrate from Musa except this one report, while a group narrated it from Musa as mursal. Haythami said in Majma (3/69), after attributing it to both of them, "It contains Harith bin Nabhan, who is discarded as a narrator, though Ibn Adi deemed him trustworthy."I say, Ibn Adi did not explicitly deem him trustworthy. Rather, after listing several hadiths for him, including the hadith under discussion, he said, "Harith has, apart from what I have mentioned, hasan hadiths, and he is among those whose hadith is written down." In this there is more of an indication toward weakening him than toward affirming his trustworthiness.On this subject there is also what was narrated from Muhammad bin Abdullah bin Jahsh, from the Messenger of Allah ﷺ, that he ordered Muaz bin Jabal, when he sent him to Yemen, to take one dinar from every forty dinars, and that there is no charity due on vegetables. This report contains Abdullah bin Shabib, of whom Ibn Hibban said in his book "Duafa", "He steals reports, and it is not permissible to rely on him under any circumstances."Likewise, nothing sahih has been established from Anas bin Malik, Ayesha, or Ali. See the source references for these hadiths in Nasb Raya (2/386).