Sura al-Tawbah 9:113

مَا كَانَ لِلنَّبِىِّ وَٱلَّذِينَ ءَامَنُوٓا۟ أَن يَسْتَغْفِرُوا۟ لِلْمُشْرِكِينَ وَلَوْ كَانُوٓا۟ أُو۟لِى قُرْبَىٰ مِنۢ بَعْدِ مَا تَبَيَّنَ لَهُمْ أَنَّهُمْ أَصْحَٰبُ ٱلْجَحِيمِ

mā kāna lil-nabiyyi wa-lladhīna āmanū an yastaghfirū lil-mushrikīna wa-law kānū ūlī qurba min baʿdi mā tabayyana lahum annahum aṣḥābu l-jaḥīmi

It is not fitting, for the Prophet and those who believe, that they should pray for forgiveness for Pagans, even though they be of kin, after it is clear to them that they are companions of the Fire.