It is narrated from the Prophet (peace and blessings be upon him) that he (peace and blessings be upon him) said: "By the One in whose hand is the soul of Muhammad (peace and blessings be upon him)! I would love to fight in the path of Allah and be killed, then be brought back to life and be killed, then be brought back to life and be killed, then be brought back to life and be killed, then be brought back to life." Sayyiduna Abu Hurayrah (may Allah be pleased with him) used to say three times: I call Allah to witness.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18487