[Machine] I heard the Messenger of Allah ﷺ say: "When one of you performs ablution, let him mention the name of Allah, for indeed, it purifies his entire body. If one of you does not mention the name of Allah upon his purifying, then only the water that has passed over it will purify it. And when one of you finishes with his purifying, let him testify that there is no god but Allah and that Muhammad is His servant and messenger. Then let him send blessings upon me. When he says that, the doors of mercy will be opened for him." This is a weak hadith, and I am not aware of its authenticity.  

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ إِذَا تَطَهَّرَ أَحَدُكُمْ فَلْيَذْكُرِ اسْمَ اللهِ عَلَيْهِ فَإِنَّهُ يُطَهِّرُ جَسَدَهُ كُلَّهُ فَإِنْ لَمْ يَذْكُرْ أَحَدُكُمُ اسْمَ اللهِ عَلَى طُهُورِهِ لَمْ يُطَهِّرْ إِلَّا مَا مَرَّ عَلَيْهِ الْمَاءُ فَإِذَا فَرَغَ أَحَدُكُمْ مِنْ طُهُورِهِ فَلْيَشْهَدْ أَنْ لَا إِلَهَ إِلَّا اللهُ وَأَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ ثُمَّ لِيُصَلِّ عَلَيَّ فَإِذَا قَالَ ذَلِكَ فُتِحَتْ لَهُ أَبْوَابُ الرَّحْمَةِ وَهَذَا ضَعِيفٌ لَا أَعْلَمُهُ