Ash'ath bin Qais says that once I invited Sayyiduna Umar (may Allah be pleased with him), his respected wife stopped him from attending the invitation, which displeased him and he hit his wife. Then he said to me, "Ash'ath! Remember three things which I have remembered after hearing them from the Prophet (peace and blessings be upon him). Do not ask any man why he hit his wife. Do not sleep without offering Witr prayer. I have forgotten the third thing."