In the Name of Allah, the Gracious, the Merciful
Imam al-Nawawi records in his book Meadows of the Righteous:
باب فضل الصلوات
Chapter on the virtue of the prayers.
Source: Riyāḍ al-Ṣāliḥīn 1/307
Allah Almighty said:
اتْلُ مَا أُوحِيَ إِلَيْكَ مِنَ الْكِتَابِ وَأَقِمِ الصَّلَاةَ إِنَّ الصَّلَاةَ تَنْهَىٰ عَنِ الْفَحْشَاءِ وَالْمُنكَرِ وَلَذِكْرُ اللَّهِ أَكْبَرُ
Recite what has been revealed to you of the Book and establish prayer. Indeed, prayer should deter one from indecency and wickedness. The remembrance of Allah is even greater. And Allah fully knows what you all do.
Surat al-‘Ankabut 29:45
Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said:
أَرَأَيْتُمْ لَوْ أَنَّ نَهَرًا بِبَابِ أَحَدِكُمْ يَغْتَسِلُ فِيهِ كُلَّ يَوْمٍ خَمْسًا مَا تَقُولُ ذَلِكَ يُبْقِي مِنْ دَرَنِهِ
If there was a river at your door 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 said:
فَذَلِكَ مِثْلُ الصَّلَوَاتِ الْخَمْسِ يَمْحُو اللَّهُ بِهَا الْخَطَايَا
That is the parable of the five prayers by which Allah removes sins.
Source: Ṣaḥīḥ al-Bukhārī 528, Grade: Muttafaqun Alayhi
Jabir ibn Abdullah reported: The Messenger of Allah, peace and blessings be upon him, said:
مَثَلُ الصَّلَوَاتِ الْخَمْسِ كَمَثَلِ نَهْرٍ جَارٍ غَمْرٍ عَلَى بَابِ أَحَدِكُمْ يَغْتَسِلُ مِنْهُ كُلَّ يَوْمٍ خَمْسَ مَرَّاتٍ
The parable of the five prayers is that of a river running at your door in which he cleanses himself five times a day.
Source: Ṣaḥīḥ Muslim 668, Grade: Sahih
Abdullah ibn Mas’ud reported: A man kissed a woman and he came to the Prophet, peace and blessings be upon him, and mentioned it to him. The verse was revealed:
أَقِمْ الصَّلَاةَ طَرَفَيْ النَّهَارِ وَزُلَفًا مِنْ اللَّيْلِ إِنَّ الْحَسَنَاتِ يُذْهِبْنَ السَّيِّئَاتِ
Establish prayer at both ends of the day and in the early part of the night. Surely good deeds wipe out evil deeds.
Surat Hud 11:114
The man said, “O Messenger of Allah, does it concern me only?” The Prophet said:
لِمَنْ عَمِلَ بِهَا مِنْ أُمَّتِي
It is for all who act upon it from my nation.
Source: Ṣaḥīḥ al-Bukhārī 4687, Grade: Muttafaqun Alayhi
Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said:
الصَّلاَةُ الْخَمْسُ وَالْجُمُعَةُ إِلَى الْجُمُعَةِ كَفَّارَةٌ لِمَا بَيْنَهُنَّ مَا لَمْ تُغْشَ الْكَبَائِرُ
The five prayers, Friday to Friday, and Ramadan to Ramadan will expiate the sins committed between them, as long as major sins are avoided.
Source: Ṣaḥīḥ Muslim 233, Grade: Sahih
Uthman ibn Affan reported: The Messenger of Allah, peace and blessings be upon him, said:
مَا مِنْ امْرِئٍ مُسْلِمٍ تَحْضُرُهُ صَلَاةٌ مَكْتُوبَةٌ فَيُحْسِنُ وُضُوءَهَا وَخُشُوعَهَا وَرُكُوعَهَا إِلَّا كَانَتْ كَفَّارَةً لِمَا قَبْلَهَا مِنْ الذُّنُوبِ مَا لَمْ يُؤْتِ كَبِيرَةً وَذَلِكَ الدَّهْرَ كُلَّهُ
No Muslim attends a prescribed prayer and performs its ablution, reverence, and bowing in the best manner, but that it will be an expiation for his previous sins as long as he did not commit a major sin, and this applies at all times.
Source: Ṣaḥīḥ Muslim 228, Grade: Sahih
Success comes from Allah, and Allah knows best.