Imam Ibn Taimiyyah, may Allāh have mercy on him, said:

No sinner should ever despair of Allāh’s forgiveness, whatever his sins might be, for indeed, no sin is too great for Allāh—All-Perfect is He—to forgive for His repentant slave.

And the generality of this ruling includes shirk¹ and all other sins, for indeed, Allāh forgives [any of] that from one who repents from it.

¹”Shirk” is treating other than Allāh as an equal of Allāh in something that is only Allāh’s, an unforgivable sin were a person to die upon it not having repented from it. \[Trans.]

Al-Fatāwá al-Kubrá, vol. 1, p. 111.

Translated by Mikail ibn Mahboob Ariff