Sunan Ibn Majah 411
سنن ابن ماجه#411SahihIt was narrated that Ibn 'Abbas said:"I saw the Messenger of Allah performing ablution, taking one handful (of water) at a time
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih Bukhari
In-book reference: 1:145