The people contended amongst themselves in the presence of the Messenger of Allah ﷺ with regard to bathing. Some of them said: We wash our heads like this and this. Upon this the Messenger ﷺ said: As for me I pour three handfuls of water upon my head. (Using translation from Muslim 327a)
تَمَارَوْا فِي الْغُسْلِ عِنْدَ رَسُولِ اللهِ ﷺ فَقَالَ بَعْضُ الْقَوْمِ أَمَّا أَنَا فَاغْسِلُ رَأْسِي كَذَا وَكَذَا فَقَالَ رَسُولُ اللهِ ﷺ أَمَّا أَنَا فَأُفِيضُ عَلَى رَأْسِي ثَلَاثَ أَكُفٍّ