Bulugh al-Maram, Book 1, Hadith 39 (In-Book) ⓘ
Narrated ‘Ali (rad) regarding the description of the ablution of the Prophet: He (the Prophet) wiped his head (with water) only once. [Reported by Abu Da’ud, An-Nasa’i, AtTirmidhi with a Sahih Sanad (authentic chain of narrators). At-Tirmidhi said, “It’s the most Hadith on this subject”].
وَعَنْ عَلِيٍّ - رضى الله عنه - -فِي صِفَةِ وُضُوءِ اَلنَّبِيِّ صَلَّى اَللَّهُ عَلَيْهِ وَسَلَّمَ- قَالَ: { وَمَسَحَ بِرَأْسِهِ وَاحِدَةً. } أَخْرَجَهُ أَبُو دَاوُد َ (44). 3 - صحيح. رواه أبو داود (111).
also referenced under: Book 1, Hadith 38 (English)