The Messenger of Allah ﷺ said, and on one occasion he was asked, "Did you trace it back to the Prophet?" He replied, "Yes." And on another occasion he said it was attributed to him,"They say 'al-karm' [referring to grapevines], but rather al-karm is the heart of the believer."
حدثنا سفيان عن الزهري عن سعيد
قال رسول الله ﷺ وقيل له مرة رفعته فقال نعم وقال مرة يبلغ به يقولون الكرم وإنما الكرم قلب المؤمن
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Its chain is sahih. Bukhari related it in 10:467 from Ibn Madini from Sufyan bin Uyayna, with this same chain. Muslim related it in 2:197, from Amr Naqid and Ibn Abu Umar, from Ibn Uyayna, with the same chain, with the wording, "Do not call it karam, for karam (true nobility) is the heart of the believer."As for the statement, "He was once asked, 'Did you raise it (to the Prophet)?' and he said, 'Yes.' Another time he said, 'He traces it back...'" it appears this is from the words of Ibn Uyayna, describing how Zuhri would raise the hadith to the Messenger of Allah ﷺ. Sometimes he raised it with the wording, "The Messenger of Allah ﷺ said," which is the wording Bukhari restricted himself to in his narration. At other times he mentioned it without stating that explicitly, so some of his listeners would ask him, "Is it marfu?" and he would say, "Yes." And at other times he raised it with the wording, "He traces it back," meaning Abu Hurairah traces it back to its highest source, attributing it to the Messenger of Allah ﷺ. All of these are explicit wordings indicating that the hadith is raised to the Prophet, according to the scholars of hadith. See Baith Hathith, our brother's commentary on Ikhtisar Uloom Hadith, page 50 of the second edition.As for the statement, "They say karam..." and so on, Hafiz said in Fath al-Bari, "This is how it occurs in this narration, from the route of Sufyan bin Uyayna, who said, 'Zuhri narrated to us from Saeed.' It occurs in the chapter before this one, from the narration of Mamar from Zuhri from Abu Salama, with the wording, 'Do not name grapes karam.'" This is the narration of Ibn Sirin from Abu Hurairah found in Muslim. And in Muslim, from the route of Hammam from Abu Hurairah, "None of you should call grapes karam, rather karam is the Muslim man."Ibn Athir said, "It is said that the grapevine was called karam because the wine made from it incites generosity and nobility, so they derived a name for it from that. So he disliked that it be named with a name derived from karam, and he made the believer more deserving of it. It is said, 'A man of karam,' meaning generous, described by the verbal noun, just as one says 'a man of justice' or 'a man of hospitality.'"Zamakhshari said in Faiq 2:407, "He intended to establish and reinforce what is in his saying ﷺ, "Indeed, the most noble of you in the sight of Allah is the most righteous of you" [Hujurat 49:13], by an elegant method, a subtle approach, and a captivating allusion. So he establishes that this type of thing, from among non-humans, being named with a name derived from karam, you are more entitled to withhold this designation from it, and not apply it to it, and not concede it to it, out of protective regard for the pious Muslim, and to keep him from having to share what Allah named him with and singled him out by making it his very attribute, let alone that you should call by the name of the noble one someone who is not a Muslim and acknowledge that for him."