‏النكاح : Hadeeth No:3245 This hadith has been narrated on the authority of Isma'il with the same chain of transmitters (and the words are):" We were young, so we said: Allaah's Messenger, should we not have ourselves castrated? But he (the narrator) did not say; We were on an expedition."...

‏الصلاة : Hadeeth No:1480 A hadith like this has been narrated by the same chain of transmitters....