‘Uqba b. 'Amir reported God’s messenger as saying, “If any Muslim performs ablution well, then stands and prays two rak'as, setting about their performance both inwardly and outwardly, he will be guaranteed paradise.”
‘Uthman performed ablution, pouring water over his hands three times, then rinsing his mouth and snuffing up water, then washing his face three times, then washing his right arm up to the elbow three times, then washing his left arm up to the elbow three times, then wiping his head, then washing his right foot three times, then the left three times. He then said, “I have seen God’s messenger performing ablution as I have done it just now,” adding, “If anyone performs ablution as I have done, then prays two rak'as* without allowing his thoughts to be distracted, his past offences will be forgiven him.”
*A section of the daily prayers. Each time of prayer has a specified number of rak'as
(Bukhari and Muslim, the wording being Bukhari’s.)
‘Umar b. al-Khattab reported, God's messenger as saying, “If anyone performs the ablution completely*, then says, ‘I testify that there in no god but God and that Muhammad is His servant and messenger’ (a version giving, ‘I testify that there is no god but God alone who has no partner, and I testify that Muhammad is His servant and messenger’), the eight gates of paradise will be opened for him and he may enter by whichever of them he wishes."
*The text has alternative words here, fa-yublighu au fa-yusbighu.
Thus Muslim transmitted it in his Sahih, and al-Humaidi among the traditions given by Muslim but not by Bukhari, as also did Ibn al-Athir in Jami' al-usul. The Shaikh Muhyi ad-Din an-Nawawi mentioned it at the end of Muslim’s traditions as we have transmitted it. Tirmidhi added, “O God, put me among the penitent, and put me among those who are purified." The tradition, “He who performs ablution and does it well" which Muhyi as-Sunna transmitted among the sound ones is transmitted identically by Tirmidhi in his Jami' except for “I testify" before the words "that Muhammad."
‘Uthman reported God’s messenger as saying, “When the time for a prescribed prayer comes, if any Muslim observes proper ablution, humility and bowing, it will be an expiation for his past sins, so long as he has not committed a major sin; and that means for all time.”