Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) said: The Messenger of Allah (peace and blessings be upon him) was standing (to answer questions) during the Farewell Pilgrimage when a man said: O Messenger of Allah! I shaved my head before sacrificing? He said: "There is no harm." Another said: I did not know and I performed the sacrifice before stoning? He said: "There is nothing wrong." Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) said: On that day, for whatever matter he was asked about in which there was precedence or delay, the Prophet (peace and blessings be upon him) replied the same: "«لا حرج»" (There is no harm). Imam Darimi (may Allah have mercy on him) said: I also hold this view, but the people of Kufa are strict about this.
Hadith Referenceسنن دارمي / من كتاب المناسك / 1946