‏الصلاة : Hadeeth No:1531 Abu Huraira reported the Prophet of Allaah (sallAllaahu alayhi wa sallam) as saying: When the prayer commences then there is no prayer (valid), but the obligatory prayer. This hadith has been narrated by Warqa' with the same chain of transmitters....

‏الحج : Hadeeth No:2758 This hadith has been reported on the authority of A'isha through another chain of transmitters....