Sahih al-Bukhari 6598
Sahih al-Bukhari · Book 82: Divine Will (Al-Qadar) · It is Allah Who knows what they would have done
Narrated Abu Huraira:
حَدَّثَنَا يَحْيَى بْنُ بُكَيْرٍ ، حَدَّثَنَا اللَّيْثُ ، عَنْ يُونُسَ ، عَنِ ابْنِ شِهَابٍ ، قَالَ وَأَخْبَرَنِي عَطَاءُ بْنُ يَزِيدَ ، أَنَّهُ سَمِعَ أَبَا هُرَيْرَةَ ، يَقُولُ سُئِلَ رَسُولُ اللَّهِ صلى الله عليه وسلم عَنْ ذَرَارِيِّ الْمُشْرِكِينَ فَقَالَ { اللَّهُ أَعْلَمُ بِمَا كَانُوا عَامِلِينَ }
Allah's Messenger (ﷺ) was asked about the offspring of the pagans. He said, "Allah knows what they would have done (were they to live)."