One of the infallible imams (s) says, ‘Allah the Almighty has given the repentant three advantages. If He has given one of them to all the inhabitants of the heavens and the earth, they will be saved by it. Allah has said,
“Surely Allah loves those who turn much (to Him), and He loves those who purify themselves.” Qur'an, 2:222
He, whom Allah loves, will never be tortured. Allah has said too:
“Those who bear the power and those around Him celebrate the praise of their Lord and believe in Him and ask protection for those who believe: Our Lord! Thou embracest all things in mercy and knowledge, therefore grant protection to those who turn (to Thee) and follow Thy way, and save them from the punishment of the hell. Our Lord! and make them enter the gardens of perpetuity which Thou hast promised to them and those who do good of their fathers and their wives and their offspring, surely Thou are the Mighty, the Wise. And keep them from evil deeds, and whom Thou keepest from evil deeds this day, indeed Thou hast mercy on him, and that is the mighty achievement.” Qur'an, 40:7-9
Allah has also said,
“And they who do not call upon another god with Allah and do not slay the soul, which Allah has forbidden except in the requirements of justice, and (who) do not commit fornication and he who does this shall find a requital of sin. The punishment shall be doubled to him on the day of resurrection, and he shall abide therein in abasement. Except him who repents and believes and does a good deed; so these are they of whom Allah changes the evil deeds to good ones; and Allah is Forgiving, Merciful.” Qur'an, 25:68-70
source : REPENTANCE THE CRADLE OF MERCY By Husayn Ansariyan