Sunan an-Nasa'i, Book 1, Hadith 231 (In-Book) ⓘ
It was narrated that 'Abdullah bin Jabr said: "I heard Anas bin Malik say: 'The Messenger of Allah used to perform Wudu' with a Makkuk and Ghusl with five Makkuks.'"
أَخْبَرَنَا سُوَيْدُ بْنُ نَصْرٍ، قَالَ أَنْبَأَنَا عَبْدُ اللَّهِ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ عَبْدِ اللَّهِ بْنِ جَبْرٍ، قَالَ سَمِعْتُ أَنَسَ بْنَ مَالِكٍ، يَقُولُ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَتَوَضَّأُ بِمَكُّوكٍ وَيَغْتَسِلُ بِخَمْسَةِ مَكَاكِيَّ .
also referenced under: Volume 1, Book 1, Hadith 230 (DarusSalam)