Sunan an-Nasa'i 1950
سنن النسائي#1950SahihIt was narrated that Abu Hurairah said:"The Messenger of Allah was asked about the children of the idolators and he said: 'Allah knows best what they would have done
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 21:133