istaghfir lahum aw laa tastaghfir lahum in tastaghfir lahum sab'eena marratan falany yaghfiral laahu lahum; zaalika bi annahum kafaroo billaahi wa Rasoolih; wallaahu laa yahdil qawmal faasiqeen
Ask forgiveness for them, [O Muhammad], or do not ask forgiveness for them. If you should ask forgiveness for them seventy times – never will Allah forgive them. That is because they disbelieved in Allah and His Messenger, and Allah does not guide the defiantly disobedient people.
1 Mufti Taqi Usmani
(It is all equal whether you) ask pardon for them or do not ask pardon for them. Even if you ask pardon for them seventy times, Allah will never pardon them. That is because they disbelieved in Allah and His Messenger. Allah does not lead the sinning people to the right path.