9:80 istagfir lahum aw laa tastagfir lahum* in tastagfir lahum sab'Iyna mar-ratan falay yagfiral-laahu lahum* dhaalika bi an-nahum kafaruu bil-laahi wa rasuulih* wal-laahu laa yahdiyl qawmal faasiqiyn

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Ahmed Raza Khan: Mohammed Aqib Qadri:
Whether you (O dear Prophet Mohammed - peace and blessings be upon him) ask forgiveness for them * or not ask forgiveness for them; even if you ask forgiveness for them seventy times, Allah will not forgive them; that is because they disbelieved in Allah and His Noble Messenger, and Allah does not guide the sinful. (* for the hypocrites.)

Yusuf Ali:
Whether thou ask for their forgiveness, or not, (their sin is unforgivable): if thou ask seventy times for their forgiveness, Allah will not forgive them: because they have rejected Allah and His Messenger: and Allah guideth not those who are perversely rebellious.

Pickthal:
Ask forgiveness for them (O Muhammad), or ask not forgiveness for them; though thou ask forgiveness for them seventy times Allah will not forgive them. That is because they disbelieved in Allah and His messenger, and Allah guideth not wrongdoing folk.