The Book of Purification
Ṣaḥīḥ Muslim 553
لاَ إِلَهَ إِلاَّ اللَّهُ وَأَنَّ مُحَمَّدًا عَبْدُ اللَّهِ وَرَسُولُهُ إِلاَّ فُتِحَتْ لَهُ أَبْوَابُ الْجَنَّةِ الثَّمَانِيَةُ يَدْخُلُ مِنْ أَيِّهَا شَاءَ
lā ilaha illā-Llāh wa-anna muḥammadan ʿabdu-Llāh warasūluhu illā futiḥat lah abwābu al-jannah ath-thamāniyah yadkhulu min ayyihā shāʾa
Transliteration generated from the Arabic vowel marks
The full narration
Uqba b. 'Amir reported:We were entrusted with the task of tending the camels. On my turn when I came back in the evening after grazing them in the pastures, I found Allah's Messenger (ﷺ) stand and address the people. I heard these words of his: If any Muslim performs ablution well, then stands and prays two rak'ahs setting about them with his heart as well as his face, Paradise would be guaranteed to him. I said: What a fine thing is this! And a narrator who was before me said: The first was better than even this. When I cast a glance, I saw that it was 'Umar who said: I see that you have just come and observed: If anyone amongst you performs the ablution, and then completes the ablution well and then says: I testify that there is no god but Allah and that Muhammad is the servant of Allah and His Messenger, the eight gates of Paradise would be opened for him and he may enter by whichever of them he wishes
Source
Ṣaḥīḥ Muslim · 553
- Agreed upon as authentic (al-Bukhārī / Muslim)