One of the women who gave the pledge of allegiance (that is, who accepted Islam at the blessed hand of the Prophet (peace and blessings be upon him)) says: The Prophet (peace and blessings be upon him) came to us, and with him were his Companions from Banu Salamah. We presented food to him and he ate. Then we presented water for ablution to him and he performed ablution. Then he turned to his Companions and said: Shall I not tell you about the things that become an expiation for sins? The people said: Yes indeed! The Prophet (peace and blessings be upon him) said: Performing ablution thoroughly at times when it is hard on oneself, going to the mosques with many steps, and waiting for one prayer after another.
Imam Ahmad recorded it; among its narrators is a person who has not been named.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2128