Sahih al-Bukhari 6422
Sahih al-Bukhari · Book 81: To make the Heart Tender (Ar-Riqaq) · The deed which is done seeking Allah's Countenance
Narrated Mahmud bin Ar-Rabi'a:
حَدَّثَنَا مُعَاذُ بْنُ أَسَدٍ ، أَخْبَرَنَا عَبْدُ اللَّهِ ، أَخْبَرَنَا مَعْمَرٌ ، عَنِ الزُّهْرِيِّ ، قَالَ أَخْبَرَنِي مَحْمُودُ بْنُ الرَّبِيعِ ، وَزَعَمَ، مَحْمُودٌ أَنَّهُ عَقَلَ رَسُولَ اللَّهِ صلى الله عليه وسلم وَقَالَ وَعَقَلَ مَجَّةً مَجَّهَا مِنْ دَلْوٍ كَانَتْ فِي دَارِهِمْ.
I remember that the Allah's Messenger (ﷺ) took water from a bucket (which was in our home used for getting water out of well) with his mouth (and threw it on my face).