Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
nasai:83 – Ḥumayd b. Masʿadah > Sufyān / Ibn Ḥabīb > Shuʿbah > al-Nuʿmān b. Sālim > Ibn Abū Aws from his father

"I saw the Messenger of Allah ﷺ trickle water into his hand until it started to drip from his hand, three times."  

النسائي:٨٣ – أَخْبَرَنَا حُمَيْدُ بْنُ مَسْعَدَةَ عَنْ سُفْيَانَ وَهُوَ ابْنُ حَبِيبٍ عَنْ شُعْبَةَ عَنِ النُّعْمَانِ بْنِ سَالِمٍ عَنِ ابْنِ أَبِي أَوْسٍ عَنْ جَدِّهِ قَالَ

رَأَيْتُ رَسُولَ اللَّهِ ﷺ اسْتَوْكَفَ ثَلاَثًا  

See similar narrations below:

Collected by Aḥmad, Nasāʾī's Kubrá
ahmad:16170 – Muḥammad b. Jaʿfar > Shuʿbah > al-Nuʿmān b. Sālim > Ibn Abū Aws from his father

[Machine] I saw the Messenger of Allah ﷺ perform ablution and wash his hands three times, meaning he washed his hands.  

أحمد:١٦١٧٠ – حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ حَدَّثَنَا شُعْبَةُ عَنِ النُّعْمَانِ بْنِ سَالِمٍ عَنِ ابْنِ أَبِي أَوْسٍ عَنْ جَدِّهِ قَالَ

رَأَيْتُ رَسُولَ اللهِ ﷺ تَوَضَّأَ واسْتَوْكَفَ ثَلَاثًا أَيْ غَسَلَ كَفَّيْهِ  

nasai-kubra:87 – Ḥumayd b. Masʿadah > Sufyān b. Ḥabīb > Shuʿbah > al-Nuʿmān b. Sālim > Ibn Aws b. Abū Aws from his father

"I saw the Messenger of Allah ﷺ trickle water into his hand until it started to drip from his hand, three times." (Using translation from Nasāʾī 83)  

الكبرى للنسائي:٨٧ – أَخْبَرَنَا حُمَيْدُ بْنُ مَسْعَدَةَ عَنْ سُفْيَانَ بْنِ حَبِيبٍ عَنْ شُعْبَةَ عَنِ النُّعْمَانِ بْنِ سَالِمٍ عَنِ ابْنِ أَوْسِ بْنِ أَبِي أَوْسٍ عَنْ جَدِّهِ قَالَ

رَأَيْتُ رَسُولَ اللهِ ﷺ «اسْتَوْكَفَ ثَلَاثًا»