The Messenger of Allah ﷺ said, "It is not right for any Muslim who has something to bequeath to spend even two nights without having his will written and kept with him."
حدثنا إسحاق أخبرني مالك عن نافع
أن رسول الله ﷺ قال ما حق امرئ له شيء يوصي فيه يبيت ليلتين إلا ووصيته مكتوبة عنده