“Your Lord's mercy is completely overwhelming. (6:147)"
“Your Lord, certainly, has forgiveness for the injustice of the people. (13:6)"
“Allah does not forgive the sin of considering others equal to Him, but He may choose to forgive other sins. (4:48)"
“When the faithful come to you, say to them, "Peace be upon you. Your Lord has decreed for Himself to be All-merciful. Anyone of you who commits a sin out of ignorance, then repents, and reforms himself will find that Allah is All-forgiving and All-merci ful." (6:54)"
Imam as-Sadiq (a) said: “On the Day of Resurrection, Allah will extend His mercy so vastly that even Eblis will expect himself to be included with that mercy." ( 3 )
“…On the Day of Resurrection, the guilty believers will be stopped before Allah Who will personally interrogate him. He will display before him his sins in details, and the believer will confess of them all. The Lord will then say: ‘In the worldly life,
I covered these sins and, now, I will cover them for you.’ He then will order to change them into virtues. As the record of that believer will be shown to people, they will say, ‘How admirable this man is! He did not commit a single sin!’ This is the meaning of God’s saying:
But only those who repent and believe and act righteously will have their sins replaced by virtue, (25:70)" ( 4 )
3. Quoted from Bihar ul-Anwar; 3/274 (as quoted from Sheikh as-Saduq’s al-Amali).
4. Quoted from Bihar ul-Anwar; vol. 3 page 274 (as quoted from al-Barqi’s al-Mahasin).
source : http://www.maaref-foundation.com