Read Qur’an: surahs, verses and hadiths

۞ قُلۡ يَٰعِبَادِيَ ٱلَّذِينَ أَسۡرَفُواْ عَلَىٰٓ أَنفُسِهِمۡ لَا تَقۡنَطُواْ مِن رَّحۡمَةِ ٱللَّهِۚ إِنَّ ٱللَّهَ يَغۡفِرُ ٱلذُّنُوبَ جَمِيعًاۚ إِنَّهُۥ هُوَ ٱلۡغَفُورُ ٱلرَّحِيمُ

Say [Allah says], “O My slaves who have transgressed against themselves, do not despair of Allah’s mercy, for indeed Allah forgives all sins[15]. He is indeed the All-Forgiving, the Most Merciful.

[15] It is for those who repent and correct themselves, no matter how big the sins are. The only unforgivable sin in Islam is dying in disbelief in Allah or associating others with Him. See 4:48. The Prophet (ﷺ) reports that Allah Almighty says, "O children of Adam! As long as you call upon Me, putting your hope in Me, I will forgive you for what you have done, and I will not mind. O children of Adam! If your sins were to reach the clouds of the sky and then you sought My forgiveness, I would forgive you. O children of Adam! If you were to come to Me with sins filling the whole world and then you came to Me without associating partners with Me, I would certainly match your sins with forgiveness." [At-Tirmidhi]

Abu Hurayrah (may Allah be pleased with him) reported that the Messenger of Allah (may Allah's peace and blessings be upon him) said: "Whoever glorifies Allah directly after each prayer thirty-three times, praises Allah thirty-three times, and proclaims the greatness of Allah thirty-three times, these are ninety-nine, and completes one hundred by saying: La ilāha illallāh wahdahu la sharīka lah, lahu al-mulku wa lahu al-hamdu wa huwa ‘ala kulli shay’in qadīr (There is no god except Allah. He is One and has no partner with Him. To Him belongs sovereignty and to Him belongs praise, and He is Omnipotent over everything), his sins will be forgiven even if they are like the sea foam."

Grade: Authentic · Attribution: Narrated by Muslim