Forgiveness means asking for forgiveness. Allah is the Forgiver of Forgiveness, the Forgiver of Forgiveness, the Most Forgiving. Istighfar is a unique act of worship; This worship is not done to forgive any sin or sin. Such as: prayers, fasting, Hajj, etc., sins are forgiven by worship; But sin is not a condition for performing these acts of worship. Repentance and repentance is one of the most beloved acts of worship of Allah. Therefore, the beloved Prophet Muhammad (peace be upon him) used to repent and ask for forgiveness 80 to 100 times a day, even though he was innocent. It is sunnat to say istighfar three times after performing these prayers, even though the prayers are the main and greatest acts of worship after such faith. That is, forgiveness is done not only after sin, but also after worship. As the Qur’an mentions asking for forgiveness after Hajj, ‘(at the end of Hajj) then go out, the way people leave and ask Allah for forgiveness. Surely Allah is Forgiving, Merciful. '(Surat al-Baqara, 2: 199).
The Qur'an says about forgiveness,
‘Ask forgiveness of your Lord, surely He is the Forgiving, the Merciful.’ (Surah Nooh, Ayat: 10).
‘Then glorify your Lord with praise and ask His forgiveness.’ (Surah 110, Nasr, verse 3).
‘And Allaah will not punish them while you are among them; And Allah will not punish them when they ask forgiveness. '(Surat al-Anfal, verse 33).
In the hadith about istighfar, the Prophet (peace and blessings of Allaah be upon him) said, ‘Whoever apologizes for a believing servant, he will get the same amount of goodness from all of them.’ (Siyare Kabir, Tabarani).