To drink while on the back of camel

Narrated Um Al-Fadl:

(daughter of Al-Harith) that she sent a bowl of milk to the Prophet while he was standing (at 'Arafat) in the afternoon of the Day of 'Arafat. He took it in his hands and drank it. Narrated Abu Nadr: The Prophet was on the back of his camel.

حَدَّثَنَا مَالِكُ بْنُ إِسْمَاعِيلَ، حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ أَبِي سَلَمَةَ، أَخْبَرَنَا أَبُو النَّضْرِ، عَنْ عُمَيْرٍ، مَوْلَى ابْنِ عَبَّاسٍ عَنْ أُمِّ الْفَضْلِ بِنْتِ الْحَارِثِ، أَنَّهَا أَرْسَلَتْ إِلَى النَّبِيِّ ﷺ بِقَدَحِ لَبَنٍ، وَهُوَ وَاقِفٌ عَشِيَّةَ عَرَفَةَ، فَأَخَذَ بِيَدِهِ فَشَرِبَهُ. زَادَ مَالِكٌ عَنْ أَبِي النَّضْرِ عَلَى بَعِيرِهِ.