Uqba bin Amir reported,

We were responsible for tending the camels, and when my turn came, I drove them back in the late afternoon. I found the Messenger of Allah ﷺ standing and addressing the people. I caught these words of his, "There is no Muslim who performs ablution and does it well, then stands and prays two rakahs with his heart and face turned attentively toward them, except that Paradise becomes guaranteed for him."I said, "How excellent this is!"Then a speaker in front of me said, "The one before it was even more excellent."I looked, and there was Umar. He said, "I saw that you arrived just a moment ago. He said, 'There is no one who performs ablution and completes it thoroughly, then says, I bear witness that there is no god but Allah and that Muhammad is His servant and messenger, except that the eight gates of Paradise are opened for him so he may enter through whichever he wishes.'"In another narration, the wording is, "I bear witness that there is no god but Allah alone with no partner, and I bear witness that Muhammad is His servant and messenger."And in another narration, the following is added after the testimony of faith, "O Allah, make me among those who turn to You in repentance, and make me among those who purify themselves."

عن عقبة بن عامر قال

كانت علينا رعاية الإبل، فجاءت نوبتي، فروحتها بعثي، فأدركت رسول الله ﷺ قائما يحدث الناس، فأدركت من قوله: ما من مسلم يتوضأ فيحسن وضوءه: ه، ثم يقوم فيصلي ركعتين مقبل عليهما بقلبه ووجهه إلا وجبت له الجنة. قال: فقلت: ما أجود هذه! فإذا قائل بين يدي يقول: التي قبلها أجود، فنظرت فإذا عمر! قال: أني قد رأيتك جئت آنفا، قال: ما من أحد يتوضأ فيبلغ أو فيسبغ الوضوء ثم يقول: أشهد أن لا إله إلا الله وأن محمدا عبده ورسوله، إلا فتحت له أبواب الجنة الثمانية يدخل من أيها شاء. وفي رواية قال: أشهد أن لا إله إلا الله وحده لا شريك له، وأشهد أن محمدا عبده ورسوله. وزاد في رواية بعد التشهد: اللهم اجعلني من التوابين، واجعلني من المتطهرين.