The Prophet (ﷺ) said: If any one of you performs ablution and performs it properly, then he says -

أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللَّهُ وَحْدَهُ لَا شَرِيْكَ لَهُ وَأَشْهَدُ أَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُوْلُهُ

Ash-hadu an laa ilaaha ill-Allahu wahdahu laa sharika lahu, wa ash hadu anna Muhammadan ‘abduhu wa Rasooluhu

I bear witness that none has the right to be worshipped but Allah alone, Who has no partner; and I bear witness that Muhammad (ﷺ) is His slave and His Messenger. The eight gates of Paradise will be opened for him; He will enter (Paradise) through whichever door he wishes.

Reference: Muslim: 234