He reported God’s Messenger as saying, “By Him in whose hand my soul is, were it not that men among the believers are not satisfied with remaining behind me when I cannot get mounts for them, I would not stay behind when an expedition goes out in God’s path. By Him in whose hand my soul is, I wish I could be killed in God’s path and brought to life, then be killed and brought to life, then be killed and brought to life, then be killed.”
(Bukhari and Muslim.)