Hadithcore
Musnad Ahmad, 873
sahih· Darussalam

It was narrated that Zirr bin Hubaish said:

`Ali (رضي الله عنه) wiped his head in wudoo` until it was about to start dripping, and he said: This is how I saw the Messenger of Allah (ﷺ) do wudoo’.

حَدَّثَنَا مَرْوَانُ بْنُ مُعَاوِيَةَ الْفَزَارِيُّ، حَدَّثَنَا رَبِيعَةُ بْنُ عُتْبَةَ الْكِنَانِيُّ، عَنْ الْمِنْهَالِ بْنِ عَمْرٍو، عَنْ زِرِّ بْنِ حُبَيْشٍ، قَالَ مَسَحَ عَلِيٌّ رَضِيَ اللَّهُ عَنْهُ رَأْسَهُ فِي الْوُضُوءِ حَتَّى أَرَادَ أَنْ يَقْطُرَ وَقَالَ هَكَذَا رَأَيْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَتَوَضَّأُ‏.‏

References1 variant
In-Book Reference
Book 5, Hadith 302