Nobody is exempted from having to seek Allah's forgiveness...

Nobody is exempted from having to seek Allah's forgiveness and to repent for his faults and shortcomings, not even the Prophets and Messengers of Allah, including the very greatest of all of them, our Prophet and Messenger Muhammad (S) who used to seek forgiveness at least a hundred times a day without having committed a sin. On p. 407, Vol.

2, of al-Kulayni's Al-Kafi , Imam Abu Abdullah al-Sadiq (as) is quoted saying that once a servant of Allah truly repents, that is, regrets having done something wrong and ceases to repeat doing it, Allah will love him and grants him a covering in the life of this world and in the hereafter.

Mu’awiya ibn Wahab asked the Imam (as) what kind of covering he was talking about, whereupon the Imam (as) said, "He (Allah) will order the angels recording his deeds to wipe out the record of his sins, then He inspires his senses to hide his sins, then He inspires the regions of the earth to hide whatever sins that man committed in them; so, he will meet the Almighty without carrying the burden of any sin, and there will be none to testify against him [on the Day of Judgment]." The Almighty has even assigned angels to pray Him to forgive those on earth and in the heavens as these verses from Surat al-Mu'min testify: Those who bear the ‘Arsh, and those around it, glorify and praise their Lord; they believe in Him and implore His forgiveness for those who believe (saying): Lord!

Your Mercy has encompassed everything, and so has Your Knowledge; so forgive those who turn (to You) in repentance and follow Your Path, and protect them from the torment of the blazing fire! And grant them, O Lord, admission into the Garden of Eternity which You have promised them and the righteous among their fathers, wives, and posterity, for You are the One Exalted in Might, the all-Knowing.

(Qur'an, Surah Ghafir 40:7-9) And the Almighty never tires of forgiving His servants and accepting their repentance. Muhammad ibn Yahya quotes Ahmed ibn Muhammad quoting Ibn Mahbub quoting al-’Alaa quoting Muhammad ibn Muslim quoting Imam Abu [father of] Ja’far al-Baqir (as) saying the following to Muhammad: "O Muhammad ibn Muslim! A sinner's sins are forgiven when he repents them; so, let a believer do good deeds following his repentance and [Allah's] forgiveness. By Allah!