Mishkat al-Masabih #87
Faith
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وعنه قال : سئل رسول الله صلى الله عليه وسلم عن ذراري المشركين قال :
" الله أعلم بما كانوا عاملين "
He also reported that when God’s messenger was questioned about the offspring of polytheists he said, “God knows best about what they were doing.”
(Bukhari and Muslim.)
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About Mishkat al-Masabih
This hadith is #87 from Mishkat al-Masabih, in the Book of Faith.