‏فضائل الصحابة‏ : Hadeeth No:5877 Ibn Abu Mulaika reported: I heard A'isha as saying and she was asked as to whom Allaah's Messenger (sallAllaahu alayhi wa sallam) would have nominated his successor if he had to nominate one at all. She said: Abu Bakr. It was said to her: Then whom after Abu Bakr? She said: Umar. It was said to her....

‏السلام : Hadeeth No:5502 This hadith has been transmitted on the authority of Sa'd b. Malik, Khuzaima b. Thabit and Usama b. Zaid....