Muwatta Malik
The Description of the Prophet, may Allah Bless Him and Grant Him Peace
Hadith #15
49.15
وَحَدَّثَنِي مَالِكٌ، عَنْ أَبِي جَعْفَرٍ الْقَارِيِّ، أَنَّهُ قَالَ رَأَيْتُ عَبْدَ اللَّهِ بْنَ عُمَرَ يَشْرَبُ قَائِمًا .
Yahya related to me from Malik that Abu Jafar al-Qari said, "I saw Abdullah ibn Umar drink while standing