Musnad Ahmad 26:79

Abu Mu'awiyah narrated to us, al-A'mash narrated to us, from Ibrahim al-Taymi, from al-Harith ibn Suwayd, from Abdullah, who said: The Messenger of Allah (ﷺ) said: "Which of you finds the wealth of his heir more beloved to him than his own wealth?" They said: "O Messenger of Allah, there is not one of us but that his own wealth is more beloved to him than the wealth of his heir." He said: "Know that there is not one of you but that the wealth of his heir is more beloved to him than his own wealth. You have nothing of your wealth except what you have sent ahead, and the wealth of your heir is what you have left behind." He said: And the Messenger of Allah (ﷺ) said: "Who do you consider to be the strong one among you?" We said: "The one whom men cannot throw down." He said: "No, but the strong one is the one who controls himself at the time of anger." He said: And the Messenger of Allah (ﷺ) said: "Who do you consider to be the childless one (al-raqub) among you?" We said: "The one who has no children." He said: "No, but the childless one is the one who has not sent ahead any of his children [i.e., who has not had any children die before him to intercede for him]."