Prophet Muhammad (peace be upon him) said,
"A strong person is not the person who throws his adversaries to the ground. A strong person is the person who contains himself when he is angry."
Al Muwatta Hadith 47.12 Yahya related to me from Malik from Ibn Shihab from Said ibn al-Musayyab from Abu Hurayra
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"When one of you becomes angry while standing he should sit down. If the anger leaves him, well and good; otherwise he should lie down."
Al-Tirmidhi Hadith 5114 Narrated by Abu Dharr
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Umar ibn Abdil-'Aziz(rahimahullah)said:
collected by Ibn Abdil-Barr in Jaami'u Bayaanil-'Ilmi wa Fadhlihi( #143)