The Book of Purification
2/6. Chapter:
Adh-Dhikr (the remembrance) which is recommended following wudu’
Sahih Muslim
وَحَدَّثَنَاهُ أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا زَيْدُ بْنُ الْحُبَابِ، حَدَّثَنَا مُعَاوِيَةُ بْنُ صَالِحٍ، عَنْ رَبِيعَةَ بْنِ يَزِيدَ، عَنْ أَبِي إِدْرِيسَ الْخَوْلاَنِيِّ، وَأَبِي، عُثْمَانَ عَنْ جُبَيْرِ بْنِ نُفَيْرِ بْنِ مَالِكٍ الْحَضْرَمِيِّ، عَنْ عُقْبَةَ بْنِ عَامِرٍ الْجُهَنِيِّ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم . قَالَ فَذَكَرَ مِثْلَهُ غَيْرَ أَنَّهُ قَالَ " مَنْ تَوَضَّأَ فَقَالَ أَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ وَحْدَهُ لاَ شَرِيكَ لَهُ وَأَشْهَدُ أَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ " .
Uqba b. 'Amir al-Juhani reported: Verily the Messenger of Allah (ﷺ) said and then narrated (the hadith) like one (mentioned above) except (this) that he said: He who performed ablution and said: I testify that there is no god but Allah, the One, there is no associate with Him and I testify that Muhammad is His servant and His Messenger.
Reference : Sahih Muslim 234bIn-book reference : Book 2, Hadith 21USC-MSA web (English) reference : Book 2, Hadith 452