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ʾillā lladhīna tābū wa-ʾaṣlaḥū wa-ʿtaṣamū bi-llāhi wa-ʾakhlaṣū dīnahum li-llāhi fa-ʾulāʾika maʿa l-muʾminīna wa-sawfa yuʾti llāhu l-muʾminīna ʾajran ʿaẓīman
except for those who repent and reform, and hold fast to Allah and dedicate their religion [exclusively] to Allah. Those are with the faithful, and soon Allah will give the faithful a great reward.
— Ali Quli Qarai
Surah An-Nisa', Verse 146
146. "Except those who repent, and amend and hold fast to (the grace of) Allah and make their religion pure for Allah. These, then, are with the believers; and Allah will grant the believers a great reward."
The way of repentance is open to all, even to the worst ones. Repentance can take a person from the position of 'the lowest stage of the Fire' to 'the Exalted Heaven'. The Qur'an says:
Human beings are free and can change the way, i.e. they can repent:
Repentance is not only an expression of regret, but it is an inclusive improvability. The verse continues saying:
Those hypocrites who repent should not feel loneliness for the absence of their fellow-minded, because they find some better colleagues instead of them.
Eclecticism in creed and thoughts is forbidden:
Then, it is to the believers to receive the true repentant ones and consider them as themselves.