Urwah (may Allah have mercy on him), in naming those of the Ansar who were present at al-Aqabah, then of Banu Zufar (and the name of Zufar is Ka'b al-Khazraj), relates: "Rifa'ah bin al-Mundhir bin Rifa'ah bin Dinar bin Zayd bin Umayyah bin Malik bin Awf bin Amr bin Awf. He was also present at Badr."
Hadith Referenceالمعجم الكبير للطبراني / باب الراء / 4539