Sahih Muslim , Book 30, Hadith 5749 (USC-MSA) ⓘ

Anas b. Malik reported that when Allah's Messenger had completed his dawn prayer, the servants of Medina came to him with utensils containing water, and no utensil was brought in which he did not dip his hand; and sometime they came in the cold dawn (and he did not feel reluctant in acceding to their request even in the cold weather) and dipped his hand in them.

حَدَّثَنَا مُجَاهِدُ بْنُ مُوسَى، وَأَبُو بَكْرِ بْنُ النَّضْرِ بْنِ أَبِي النَّضْرِ وَهَارُونُ بْنُ عَبْدِ اللَّهِ جَمِيعًا عَنْ أَبِي النَّضْرِ، قَالَ أَبُو بَكْرٍ حَدَّثَنَا أَبُو النَّضْرِ، - يَعْنِي هَاشِمَ بْنَ الْقَاسِمِ - حَدَّثَنَا سُلَيْمَانُ بْنُ الْمُغِيرَةِ، عَنْ ثَابِتٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم إِذَا صَلَّى الْغَدَاةَ جَاءَ خَدَمُ الْمَدِينَةِ بِآنِيَتِهِمْ فِيهَا الْمَاءُ فَمَا يُؤْتَى بِإِنَاءٍ إِلاَّ غَمَسَ يَدَهُ فِيهَا فَرُبَّمَا جَاءُوهُ فِي الْغَدَاةِ الْبَارِدَةِ فَيَغْمِسُ يَدَهُ فِيهَا ‏.‏