I came to Abū ʿAbd al-Raḥmān and found him cauterizing a boy. I said, "Are you cauterizing him?" He replied, "Yes, it is the remedy of the Arabs." ʿAbd Allāh ibn Masʿūd mentioned it as a marfūʿ ḥadīth. Its narrators are trustworthy except for ʿAlī ibn ʿĀṣim, who is truthful but makes mistakes, as mentioned in "al-Taqrīb." Sufyān followed him in "al-Mustadrak" (4/399) with a similar narration from ʿAṭāʾ. It was authenticated, and al-Dhahabī agreed with it. There is another chain with the wording: "Indeed, Allāh has not sent down a disease except that He has sent down a cure for it, except for old age. So, take the milk of cows, for it feeds on every tree." It was recorded by al-Ḥākim (4/197) and al-Ṭayālisī (no. 368) through the chain of al-Masʿūdī from Qays ibn Muslim from Ṭāriq ibn Shihāb from ʿAbd Allāh ibn Masʿūd as a marfūʿ ḥadīth. Al-Masʿūdī had experienced confusion. However, there is another chain with the wording: "Allāh has not sent down a disease except that He has sent down a remedy for it. So, take the milk of cows, for it feeds on every tree." It was narrated by al-Nasāʾī in "al-Walīmah" (2/64/2), Ibn Ḥibbān (1398), and Ibn ʿAsākir (8/242/2) from Muḥammad ibn Yūsuf from Sufyān from Qays ibn Muslim from Ṭāriq ibn Shihāb from ʿAbd Allāh ibn Masʿūd as a marfūʿ ḥadīth. I say: This chain is authentic; all its narrators are trustworthy, the narrators of the two Shaykhs, and Muḥammad ibn Yūsuf is al-Firyābī, who is trustworthy. However, ʿAbd al-Raḥmān ibn Mahdī differed, as he narrated it from Sufyān but sent it, not mentioning Ibn Masʿūd. It was recorded by Aḥmad (4/315) and also by al-Nasāʾī. Then it was recorded through the chain of al-Rabīʿ ibn Lūṭ from Qays ibn Muslim with the same narration as al-Firyābī, except that he stopped it at Ibn Masʿūd. Ibn Lūṭ is trustworthy, as in..