Prayer An Expiation For Past Sins

Narrated by Uthman ibn uffan (Radhiallaho anho):
I heard Allah’s Messenger (sallAllaahu ‘alaihi wasallam) say: When the time for a prescribed prayer comes if any Muslim performs ablution well and offers his prayer) with humility and bowing, it will be an expiation for his past sins, so long as he has not committed a major sin; and this applies to all times.
Sahih Muslim Number 441

Invoke blessing after Adan
Narrated by Abdullah ibn Amr ibn al-‘As (Radhiallaho anho):
Allah’s Messenger (sallAllaahu ‘alaihi wasallam) said: When you hear the Mu’adhdhin (who says Adhan), repeat what he says, then invoke a blessing on me, for everyone who invokes a blessing on me will receive ten blessings from Allah: then beg from Allah al-Wasilah for me, which is a rank in Paradise fitting for only one of Allah’s Servants, and I hope that I may be that one. If anyone asks that I be given the Wasilah, he will be assured of my intercession.
Sahih Muslim Number 747

Allah elevates the ranks (of man)
Narrated by Abu Huraira (Radhiallaho anho):
Allah’s Messenger (sallAllaahu ‘alaihi wasallam) said: Should I not suggest to you that by which Allah obliterates the sins and elevates the ranks (of man)? They (the hearers) said: Yes, Messenger of Allah. He said: Performing the ablution thoroughly despite odds, traversing at more pace towards the mosque, and waiting for the next prayer after observing a prayer, and that is mindfulness.
Sahih Muslim Number 485

Establish Straight rows in prayer
Narrated by Abu Huraira(Radhiallaho anho):
Allah’s Messenger (sallAllaahu ‘alaihi wasallam)(directed us thus): Establish rows in prayer, for the making of a row (straight) is one of the merits of prayer.
Sahih Muslim Number 873

Excellence lies in the first rows
Narrated by Abu Huraira (Radhiallaho anho):
Allah’s Messenger (sallAllaahu ‘alaihi wasallam) said: If you were to know, or if they were to know, what (excellence) lies in the first rows, there would have been drawing of lots (for filling them); and Ibn Harb said: For (occupying) the first row there would have been drawing of lots.
Sahih Muslim Number 880

Man is nearest to Allah when he is prostrating
Narrated by Abu Huraira (Radhiallaho anho):
Allah’s Messenger (sallAllaahu ‘alaihi wasallam) said: The nearest a servant comes to his Lord is when he is prostrating himself, so make supplication (in this state).
Sahih Muslim Number 979

Supplication of prostrating
Narrated by Abu Huraira (Radhiallaho anho):
Allah’s Messenger (sallAllaahu ‘alaihi wasallam) used to say while prostrating himself: O Lord, forgive me all my sins, small and great, first and last, open and secret.
Sahih Muslim Number 980

Friday Prayer
Narrated by Abu Huraira (Radhiallaho anho):
Allah’s Messenger (sallAllaahu ‘alaihi wasallam) said: Five prayers and from one Friday prayer to (the next) Friday prayer is an expiation (of the sins committed in between their intervals) if major sins are not committed.
Sahih Muslim Number 448