Sunan an-Nasa'i 81
سنن النسائي#81Sahihأَخْبَرَنَا سُوَيْدُ بْنُ نَصْرٍ، قَالَ أَنْبَأَنَا عَبْدُ اللَّهِ بْنُ الْمُبَارَكِ، قَالَ أَنْبَأَنَا الأَوْزَاعِيُّ، قَالَ حَدَّثَنِي الْمُطَّلِبُ بْنُ عَبْدِ اللَّهِ بْنِ حَنْطَبٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، تَوَضَّأَ ثَلاَثًا ثَلاَثًا يُسْنِدُ ذَلِكَ إِلَى النَّبِيِّ صلى الله عليه وسلم .
Al-Muttalib bin 'Abdullah bin Hantab (narrated) that 'Abdullah bin 'Umar performed Wudu', washing each part of the body three times, and he attributed that to the Prophet (ﷺ)
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih
In-book reference: 1:81