"If the one who drinks while standing knew what is in his stomach, he would vomit." Narrated by Aḥmad (7795 and 7796) from al-Zuhrī from a man, and from al-Aʿmash from Abū Ṣāliḥ, both from Abū Hurayrah who said: The Messenger of Allāh (ṣallá Allāhu ʿalayhi wa-sallam) said: It was also narrated by al-Ṭaḥāwī in "Mushkil al-Āthār" (3/18) from al-Aʿmash with the addition: "It reached ʿAlī ibn Abī Ṭālib, so he stood and drank while standing." I say: The second isnād is authentic with narrators from al-Bukhārī and Muslim, and in the first isnād, the man who is unnamed, if he is other than al-Aʿmash, it strengthens the ḥadīth, and if he is the same, it does not weaken it, as is apparent. In "Majmaʿ al-Zawāʾid" (5/79): "Narrated by Aḥmad with two isnāds, and al-Bazzār, and one of Aḥmad's isnāds has narrators from the authentic collections." The ḥadīth subtly alludes to the prohibition of drinking while standing, and this has been explicitly stated in the ḥadīth of Anas (raḍiya Allāhu ʿanhu) which is: "He forbade" and in another wording: "He rebuked" drinking while standing.