Crowd conditions are especially difficult during the final day of Hajj, which is the day pilgrims leave the valley of Mina and return to Mecca for the farewell Tawaf (the final circumambulation of the Kaaba). According to hadith, Muhammad's last stoning was performed just after the noon prayer. Many scholars feel that the ritual can be done any time between noon and sunset on this day; however, many Muslims are taught that it should be done immediately after the noon prayer.