Repentance
[9:80]
[And] whether thou dost pray [unto God] that they be forgiven or dost not pray for them – [it will all be the same: for even] if thou wert to pray seventy times that they be forgiven, God will not forgive them, seeing that they are bent on denying God and His Apostle. And God does not bestow His guidance upon such iniquitous folk.

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* v.80 : I.e., many times. In Arabic usage, the number “seventy” often stands for “many,” just as “seven” is a synonym for “several” (see Lisān al-‘Arab and Tāj al-‘Arūs). It is evident from many authentic Traditions (recorded, among others, by Bukhārī and Muslim) that the Prophet often prayed to God that He pardon his enemies.
* I.e., “those who are so deeply rooted in their iniquity and in their insolent persistence in evildoing (tamarrud)... [that] they have lost all disposition for repentance and belief” (Manār X, 657).