Sunan Ibn Majah Book 1, Hadith 161

The Messenger of Allah say: "Shall I not tell you of something by means of which Allah expiates for sins and increases good deeds?" They said: "Yes, O Messenger of Allah." He said: "Perform ablution properly despite difficulties, increasing the number of steps one takes towards the mosque and waiting for the next prayer after prayer.'"

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"The Messenger of Allah commanded us to perform ablution properly."

Sunan Ibn Majah Book 1, Hadith 160
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The Prophet said: "Sins are expiated by well-performed ablution despite difficulties, increasing the number of steps one takes towards the mosque, (and waiting for the next prayer after prayer)."

Sunan Ibn Majah Book 1, Hadith 162