Coming back to the above question, regarding the signs that Allah SWT has accepted a person's repentance is when his attitude and character change, his soul became closer and his love for the mosque increases, his manners and language improve, he feels happy when worshipping and he continues to seek for forgiveness ...
Islam teaches human beings to be forgiving and if someone sincerely asks for forgiveness, the wronged person should forgive him. Our beloved Prophet (Peace be upon him) said: “Whoever suffers an injury and forgives (the person responsible), Allah will raise his status to a higher degree and remove one of his sins.”
And all sins are eligible for forgiveness through God's mercy and repentance.
It is never too late for a true Muslim to repent to Allah, and to shed tears for the wrongdoing he has committed, keeping in mind that if one manages to escape the punishment of mortals, he will not for sure escape the punishment of Allah in the Hereafter.
Follow up your misdeed immediately with regret and remorse towards Allah. Repent sincerely by verbalizing 'astaghfirullah,' which means, “I seek forgiveness from Allah.” Resolve to never commit the sin again.
He said: “Associating others with Allah (shirk); witchcraft (sihr); killing a soul whom Allah has forbidden us to kill, except in cases dictated by Islamic law; consuming riba; consuming orphans' wealth; fleeing from the battlefield; and slandering chaste, innocent women.”
— J.F.D. Rev. Graham: Only one sin that can't be forgiven is on God's list — and that is the sin of rejecting Him and refusing His offer of forgiveness and new life in Jesus Christ. This alone is the unforgivable sin, because it means we are saying that the Holy Spirit's witness about Jesus is a lie (see Luke 12:10).
Whether you sin the next day or the next month, make sincere taubah(repentance) every time you commit a sin. Armed with the strength of hope in the mercy of Allah, and the belief that sincere repentance wipes away all sin, you have to strategize and plan.
The Prophet Muhammad (pbuh) said: “No person suffers any anxiety or grief and says this supplication, but Allah will take away his sorrow and grief, and give him in their stead joy. Having said that, however, Muslims are not immune to the feeling of grief or depression.
Perform good deeds to erase bad deeds. Except those who repent and believe (in Islamic Monotheism), and do righteous deeds; for those, Allah will change their sins into good deeds, and Allah is Oft‑Forgiving, Most Merciful.”.
There are two things to remember here: (1) God's mercy is indeed infinite, and (2) true repentance means forsaking your sins. On the one hand, because of the infinite Atonement of Jesus Christ, repentance is available to everyone, even those who have made the same mistakes many times.
Sincere tawba is always accepted by Allah. Allah says: Verily, He is One Who forgives (accepts repentance), the Most Merciful. In numerous verses of the Quran, Allah describes Himself as being extremely generous, merciful, and forgiving towards His creations.
One eternal or unforgivable sin (blasphemy against the Holy Spirit), also known as the sin unto death, is specified in several passages of the Synoptic Gospels, including Mark 3:28–29, Matthew 12:31–32, and Luke 12:10, as well as other New Testament passages including Hebrews 6:4–6, Hebrews 10:26–31, and 1 John 5:16.
A: There are many sins recounted in the Hebrew Bible but none are ever called unforgivable sins.
Jesus forgives all sin
The Bible teaches that the blood Jesus' shed on the cross covers all sin, including infidelity. “… the blood of Jesus, God's Son, purifies us from all sin” (1 John 1:7). This means that any sin we commit, including infidelity, can be forgiven when we come to Jesus with a repentant heart.
'Loving life is the mother of all sins.
Do Tasbih of Astaghfaar at least 100 times daily as it is the Sunnah of Prophet Muhammad (SallAllahu Alayhi Wa Sallam). In short time, you can say “Astaghfiru Allaah” more than 100 times!
Astaghfir Allah wa atoobu ilayh. I seek the forgiveness of Allah and repent to Him (Bukhari, Muslim. It is recommended that this Dua be said 100 times during the day).
This period can be as long as three years for multiple serious transgressions and should not be less than one year from the most recent serious incident. May the Lord guide you and direct you through the promptings of His Holy Spirit as you go through the repentance process.
Ibn Umar reported: The Messenger of Allah, peace and blessings be upon him, said, “O people, turn to Allah in repentance. Verily, I repent to Him one hundred times in a day.”
As the hadith mentions, if a person commits a sin or a bad deed unwillingly, then realizes they have committed a sin, they have the opportunity to erase it by doing a good deed or an act of charity.
Islamic legal tradition treats any sexual contact outside a legal marriage as a crime. The main category of such crimes is zina, defined as any act of illicit sexual intercourse between a man and woman.