Sayyiduna Wathilah bin al-Asqa' (may Allah be pleased with him) says that he heard the Messenger of Allah (peace and blessings be upon him) say: "You think that I will be the last of you to die, whereas I am the first of you to depart; then after me you will come in group after group, killing one another."
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18386