‏الصلاة : Hadeeth No:1798 Ishaq is reported to have said on the authority of Aswad who quoted on the authority of 'Abdullah b. Mas'ud that the Prophet of Allaah (sallAllaahu alayhi wa sallam) used to recite these words as (fahal min muddakir)....

‏فضائل الصحابة‏ : Hadeeth No:6136 This hadith has been transmitted on the authority of Abu Zur'a with a slight variation of wording....