Sayyiduna Anas (may Allah be pleased with him) states: The Prophet (peace and blessings be upon him) passed by some people who were lifting a stone. He said: "What are these people doing?" The people said: "They lift the stone to show their strength." The Prophet (peace and blessings be upon him) said: "Shall I not guide you to someone who is stronger than such a person (the narrator is in doubt; perhaps he said some other word like it)? It is the one who controls himself at the time of anger."
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأدب / 12981