The five Salat (prayers) are expiations (of sins)
باب الصَّلَوَاتُ الْخَمْسُ كَفَّارَةٌ
Sahih al-Bukhari, Book of Times of the Prayers(view book)
Sahih al-Bukhari 528
Narrated Abu Huraira:
I heard Allah's Apostle saying, "If there was a river at the door of anyone of you and he took a bath in it five times a day would you notice any dirt on him?" They said, "Not a trace of dirt would be left." The Prophet added, "That is the example of the five prayers with which Allah blots out (annuls) evil deeds."
حَدَّثَنَا إِبْرَاهِيمُ بْنُ حَمْزَةَ، قَالَ حَدَّثَنِي ابْنُ أَبِي حَازِمٍ، وَالدَّرَاوَرْدِيُّ، عَنْ يَزِيدَ، عَنْ مُحَمَّدِ بْنِ إِبْرَاهِيمَ، عَنْ أَبِي سَلَمَةَ بْنِ عَبْدِ الرَّحْمَنِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّهُ سَمِعَ رَسُولَ اللَّهِ ﷺ يَقُولُ " أَرَأَيْتُمْ لَوْ أَنَّ نَهَرًا بِبَابِ أَحَدِكُمْ، يَغْتَسِلُ فِيهِ كُلَّ يَوْمٍ خَمْسًا، مَا تَقُولُ ذَلِكَ يُبْقِي مِنْ دَرَنِهِ ". قَالُوا لاَ يُبْقِي مِنْ دَرَنِهِ شَيْئًا. قَالَ " فَذَلِكَ مِثْلُ الصَّلَوَاتِ الْخَمْسِ، يَمْحُو اللَّهُ بِهَا الْخَطَايَا ".