Hadith 25:216
Abu Usama narrated to us, he said: Ubaydullah narrated to us, from Nafi’, from Ibn Umar, from the Prophet (peace and blessings of Allah be upon him), who said: "It is not the right of a Muslim man who has something to bequeath to spend two nights without having his will written down with him."
حدثنا أبو أسامة قال ثنا عبيد الله عن نافع عن بن عمر عن النبي صلى الله عليه وسلم قال ما حق امرئ مسلم يبيت ليلتين وله شيء يوصي به إلا وصيته مكتوبة عنده