My father reported from the Messenger of Allah ﷺ that he said, "Truffles are from the manna, and their water is a cure for the eye."
حدثنا عبد الصمد حدثني أبي حدثنا عطاء بن السائب
حدثني أبي عن رسول الله ﷺ قال الكمأة من السلوى وماؤها شفاء للعين
Its isnad is sahih. Abdul-Samad is Abdul-Warith's son. This hadith carries the same meaning as the one before it, but it is not part of the musnad of Saeed bin Zayd. Rather, it belongs to the musnad of Hurayth bin Amr bin Uthman bin Abdullah bin Amr bin Makhzum al-Qurashi, who was a companion. Bukhari gave his biography in al-Kabir 2/64/1–65, saying, "He is counted among the Kufans, and there is disagreement about him." Ibn Abdul-Barr also gave his biography in al-Istiab, page 119, saying, "He carried his son Amr bin Hurayth to the Prophet, who prayed for him," then he pointed to this hadith. Ibn Athir likewise gave his biography in Usd al-Ghaba 1:399, and so did the Hafiz in al-Isaba, page 42, where he mentioned two other hadiths for him from Sahih Abu Awana and from the book of Ibn Abu Khaythama. He then mentioned the hadith found here from the musnad of Musaddad, and said, "Ibn Sakan said, 'Perhaps Abdul-Warith made a mistake in it.' Daraqutni said in al-Afrad, 'Abdul-Warith alone transmitted it, and Hurayth is not known to have companionship or narration. Rather, Amr bin Hurayth narrated it from Saeed bin Zayd.' Ibn Manda said, 'The hadith of Saeed is the correct one.'"Then the Hafiz said, "I say, reliance on his companionship rests on the first and second reports," as though he accepted the criticism of this hadith. But I do not see this as a valid criticism, for Abdul-Warith bin Saeed is trustworthy, a proof, and a hafiz. Abu Hatim said, "He is more reliable than Hammad bin Salama." So to judge him as having erred without evidence is unacceptable.For this reason Bukhari mentioned the hadith in Hurayth's biography, from Musaddad, from Abdul-Warith, with this isnad, then said, "Hasan al-Arabi and Abdul-Malik bin Umayr narrated it from Amr bin Hurayth, from Saeed bin Zayd, from the Prophet." He did not add any comment favoring one report over the other, as though he considered them both sahih. I think that what Imam Ahmad did here points to the same conclusion, since he narrated the hadith of Hurayth right after the hadith of Saeed. This would mean that Amr bin Hurayth heard the hadith both from his father and from Saeed bin Zayd.