Yahya ibn Yahya, Sa'id ibn Mansur, Abu al-Rabi', and Qutaybah ibn Sa'id narrated to us—Yahya said: "He informed us," while the others said: "He narrated to us"—Abu 'Awanah narrated from Bukayr ibn al-Akhnas, from Mujahid, from Ibn 'Abbas, who said: "Allah prescribed the prayer upon the tongue of your Prophet, peace and blessings be upon him, as four [rak'ahs] when resident, two rak'ahs when traveling, and one rak'ah in times of fear."