Hisnul Muslim 13

Upon completing the ablution

أَشْهَدُ أَنْ لَا إِلَـهَ إِلاَّ اللّهُ وَحْدَهُ لَا شَريـكَ لَـهُ وَأَشْهَدُ أَنَّ مُحَمَّـداً عَبْـدُهُ وَرَسُـولُـهُ

'Ash-hadu 'an laa 'ilaaha 'illallaahu wahdahu laa shareeka lahu wa 'ash-hadu 'anna Muhammadan 'abduhu wa Rasooluhu.

I bear witness that none has the right to be worshiped but Allah alone, Who has no partner; and I bear witness that Muhammad is His slave and His Messenger.