The Prophet Muhammad (sallAllaahu 'alayhi wa sallam) said: Anyone of you who recites the following verse after completing his Ablution (wudhu), For him, all the Eight doors of Jannah are opened, and he can enter through whichever Gate he wishes:
أَشْهَدُ أَنْ لَا إِلَهَ إلَّا اللهُ وَحْدَهُ لَا شَرِيكَ لَهُ، وَأ...َشْهَدُ أَنَّ مُحَمَّداً عَبْدُهُ وَرَسُولُهُ
"Ash-hadu 'an la 'ilaha 'illallahu wahdahu la sharika lahu wa 'ash-hadu 'anna Muhammadan 'abduhu wa Rasuluhu."
▶Translation: I bear witness that none has the right to be worshipped but Allah alone, Who has no partner; and I bear witness that Muhammad is His slave and His Messenger.
[Muslim: Book 2 Hadith 451]
أَشْهَدُ أَنْ لَا إِلَهَ إلَّا اللهُ وَحْدَهُ لَا شَرِيكَ لَهُ، وَأ...َشْهَدُ أَنَّ مُحَمَّداً عَبْدُهُ وَرَسُولُهُ
"Ash-hadu 'an la 'ilaha 'illallahu wahdahu la sharika lahu wa 'ash-hadu 'anna Muhammadan 'abduhu wa Rasuluhu."
▶Translation: I bear witness that none has the right to be worshipped but Allah alone, Who has no partner; and I bear witness that Muhammad is His slave and His Messenger.
[Muslim: Book 2 Hadith 451]