The Book of Purification
1/103. Chapter:
Using Water Left Over From Wudu'
Sunan an-Nasai
أَخْبَرَنَا مُحَمَّدُ بْنُ مَنْصُورٍ، عَنْ سُفْيَانَ، قَالَ سَمِعْتُ ابْنَ الْمُنْكَدِرِ، يَقُولُ سَمِعْتُ جَابِرًا، يَقُولُ مَرِضْتُ فَأَتَانِي رَسُولُ اللَّهِ صلى الله عليه وسلم وَأَبُو بَكْرٍ يَعُودَانِّي فَوَجَدَانِي قَدْ أُغْمِيَ عَلَىَّ فَتَوَضَّأَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَصَبَّ عَلَىَّ وَضُوءَهُ .
Ibn Al-Munkadir said: "I heard Jabir say: 'I fell sick, and the Messenger of Allah (ﷺ) and Abu Bakr came to visit me. They found me unconscious, so the Messenger of Allah (ﷺ) performed Wudu' and poured his Wudu' water over me.'"
Reference : Sunan an-Nasa'i 138In-book reference : Book 1, Hadith 139English translation : Vol. 1, Book 1, Hadith 138