The Prophet ﷺ was asked about the children of the polytheists, and he replied, "Allah knows best what they would have done."
حدثنا حسين قال حدثنا ابن أبي ذئب عن الزهري عن عطاء بن يزيد الليثي
عن النبي ﷺ أنه سئل عن أولاد المشركين فقال الله أعلم بما كانوا عاملين
Its isnad is sahih. It has already appeared at 1845. See the commentary on the previous one.