وَعَنْهُ قَالَ: «كَانَ اَلنَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: إِذَا تَوَضَّأَ أَدَارَ اَلْمَاءَ عَلَى مُرْفَقَيْهِ»
The Prophet (sallallahu alayhi wa sallam) used to run the water down his elbows while performing ablution.
Bulugh al-Maram 56, Book 1, The Book of Purification, Hadith 56. 1 min read