"The Messenger of Allah was asked about he children of the idolators and he said: 'Allah knows best what they would have done."' (Using translation from Nasāʾī 1952)
سُئِلَ رَسُولُ اللهِ ﷺ عَنْ ذَرَارِيِّ الْمُشْرِكِينَ فَقَالَ «اللهُ أَعْلَمُ بِمَا كَانُوا عَامِلِينَ»