Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrated from the Messenger of Allah (peace and blessings be upon him) that he was asked (on the occasion of Hajj) about offering sacrifice, shaving the head, and the order of performing the stoning of the Jamarat, whether they could be done earlier or later, so the Prophet (peace and blessings be upon him) said: "There is no harm."