Ibn Ishaq (may Allah have mercy on him) said, among the names of the Ansar who were present at Badr: Asim bin Thabit bin Qays bin al-Aflah bin Ismah bin Malik bin Umayyah bin Sa'sa'ah bin Zayd bin Malik bin Awf bin Amr bin Awf (may Allah be pleased with him).
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14534