No one of you should drink while standing
Authentic hadithعن أبي هريرة رضي الله عنه قال: قال رسول الله صلى الله عليه وسلم : «لا يشربَنَّ أحدٌ منكم قائما».
Abu Hurayrah (may Allah be pleased with him) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) said: "No one of you should drink while standing."
Explanation
The Hadīth includes the forbiddance to drink while standing. This forbiddance applies when there is no need to drink while standing, and it indicates dislike of doing that.
Source · Narrated by Muslim
From the Hadith Encyclopedia (hadeethenc.com).