‏الجهاد والسير‏ : Hadeeth No:4323 Sa'b b. Jaththama has narrated that the Prophet (sallAllaahu alayhi wa sallam) asked: What about the children of polytheists killed by the cavalry during the night raid? He said: They are from them....

‏فضائل الصحابة‏ : Hadeeth No:5908 This hadith has been transmitted on the authority of Uthman and A'isha with the same wording....