Muwatta Imam Malik (Riwayat Ibn al-Qasim)

And with this same chain (it is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him) that the Messenger of Allah, peace and blessings be upon him, said: "By the One in Whose hand is my soul! I wish that I fight in the way of Allah, then be killed, then be brought back to life (so I may fight again), then be killed, then be brought back to life, then be killed." Then Sayyiduna Abu Hurairah, may Allah be pleased with him, said three times: "I bear witness by Allah."