Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "Whom do you count among yourselves as al-raqub (the childless)?" They said: The one who has no children. He (peace and blessings be upon him) said: "That is not al-raqub; rather, it means the man none of whose children have gone ahead of him." Then he (peace and blessings be upon him) said: "Whom do you consider al-sur'ah (the brave one)?" They said: The one whom people cannot throw down. He (peace and blessings be upon him) said: "Not that one; rather, the brave one is he who keeps control of himself at the time of anger."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 7145