Harun ibn Ma'ruf narrated to us, 'Abdullah ibn Wahb narrated to us, 'Amr—who is Ibn al-Harith—informed me, from Ibn Shihab, from Salim, from his father, that he heard the Messenger of Allah, peace and blessings be upon him, say: "It is not right for a Muslim man who has something to bequeath to spend three nights without his written will being with him." 'Abdullah ibn 'Umar said: No night has passed over me since I heard the Messenger of Allah, peace and blessings be upon him, say that, except that my will was with me.