حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، عَنْ حُسَيْنٍ الْمُعَلِّمِ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، قَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَشْرَبُ قَائِمًا وَقَاعِدًا ‏.‏ قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ ‏.‏

Narrated 'Amr bin Shu'aib: From his father, from his grandfather who said: "I saw the Messenger of Allah (PBUH) drinking while standing and sitting." [Abu 'Eisa said:] This Hadith is Hasan Sahih. Translation Not Available

Book reference: Jamiya Tirmidhi Book 26 Hadith 1883
Web reference: Jamiya Tirmidhi Volume 3 Book 24 Hadith 1883