I saw the Messenger of Allah ﷺ performing ablution. He wiped his head front and back, his temples and his ears once. (Using translation from Abū Dāʾūd 129)
أَنَّهَا رَأَتْ رَسُولَ اللهِ ﷺ يَتَوَضَّأُ قَالَتْ «فَمَسَحَ رَأْسَهُ مَا أَقْبَلَ مِنْهُ وَمَا أَدْبَرَ وَصُدْغَيْهِ وَأُذُنَيْهِ مَرَّةً وَاحِدَةً»