‏الصلاة : Hadeeth No:961 Al-Bara' reported: When we were (in prayer) with the Messenger of Allaah Allaah (sallAllaahu alayhi wa sallam) none of us benfft his back till we saw he prostrated. Zuhair and others reported:" till we saw him prostrating"....

‏الطلاق : Hadeeth No:3505 A hadith like this has been transmitted on the authority of 'A'isha through another chain of narrators....