Salaat Al-tauba (The Prayer of Repentance)

Bismillahirrahmanirrahim 

Salaat Al-tauba (The Prayer of Repentance)

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✦ Narrated Ali Radi Allahu Ahnhu that Abu bakr siddiq Radi Allahu Anhu said that The Prophet Sal-Allahu Alaihi Wasallam said When a servant (of Allah) commits a sin, and he performs ablution well, and then stands and prays two rak'ahs, and asks pardon of Allah, Allah pardons him. He then recited this verse: 

وَالَّذِينَ إِذَا فَعَلُوا فَاحِشَةً أَوْ ظَلَمُوا أَنفُسَهُمْ ذَكَرُوا اللَّهَ فَاسْتَغْفَرُوا لِذُنُوبِهِمْ وَمَن يَغْفِرُ الذُّنُوبَ إِلَّا اللَّهُ وَلَمْ يُصِرُّوا عَلَىٰ مَا فَعَلُوا وَهُمْ يَعْلَمُونَ

And those who, when they have committed Fahishah (illegal sexual intercourse) or wronged themselves with evil, remember Allah and ask forgiveness for their sins; - and none can forgive sins but Allah - and do not persist in what (wrong) they have done, while they know.

(Al-Qur'an 3:135).

Sunan Abu Dawud, Book 8, 1516-Sahih