Hazrat Abu Bakr bin Abi Musa Ash'ari (may Allah be pleased with him) narrates that once, when my father faced the enemy, he said: I heard the Messenger of Allah (peace and blessings be upon him) say that swords are the keys to Paradise. Upon hearing this hadith, a man in a disheveled state said, "O Abu Musa (may Allah be pleased with him)! Did you hear this from the Messenger of Allah (peace and blessings be upon him)?" Hazrat Abu Musa (may Allah be pleased with him) replied, "Yes, I heard it." Upon this, the man drew his sword, broke its sheath, greeted his companions, then advanced towards the enemy and kept fighting them until he was martyred.