"I heard 'Abbad bin Tamim narrate from my grandmother - who was Umm 'Umarah bint Ka'b - that the Prophet ﷺ performed Wudu', and he was brought a vessel in which there were two-thirds of a Mudd." Shu'bah said: "I remember that he washed his forearms and started rubbing them, and he wiped the inside of his ear, but I do not remember whether he wiped the outside of them." (Using translation from Nasāʾī 74)
أَنَّ النَّبِيَّ ﷺ تَوَضَّأَ فَأُتِيَ بِمَاءٍ فِي إِنَاءٍ قَدْرَ ثُلُثَيِ الْمُدِّ قَالَ شُعْبَةُ فَأَحْفَظُ أَنَّهُ غَسَلَ ذِرَاعَيْهِ وَجَعَلَ يَدْلُكُهُمَا وَمَسَحَ أُذُنَيْهِ بَاطِنَهُمَا وَلَا أَحْفَظُ أَنَّهُ مَسَحَ ظَاهِرَهُمَا