Narrated by:Salamah bin Akwa' said
It was narrated that Salamah bin Akwa' said:"I saw the Messenger of Allah performing ablution, and he wiped his head once."
حَدَّثَنَا مُحَمَّدُ بْنُ الْحَارِثِ الْمِصْرِيُّ، حَدَّثَنَا يَحْيَى بْنُ رَاشِدٍ الْبَصْرِيُّ، عَنْ يَزِيدَ، مَوْلَى سَلَمَةَ عَنْ سَلَمَةَ بْنِ الأَكْوَعِ، قَالَ رَأَيْتُ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ تَوَضَّأَ فَمَسَحَ رَأْسَهُ مَرَّةً .
IbnMaja
The Book of Purification and its Sunnah • Hadith 437