Zuhri reported,

Salim reported from his father that he heard the Messenger of Allah ﷺ say, "No Muslim who has something to bequeath should let three nights pass without having his will written down and kept with him."Abdullah bin Umar said, "Not a single night has passed over me since I heard the Messenger of Allah ﷺ say that without my will being with me."

Muslim 4208

Sahih

و حدثنيه أبو الطاهر وحرملة قالا أخبرنا ابن وهب أخبرني يونس ح و حدثني عبد الملك بن شعيب بن الليث حدثني أبي عن جدي حدثني عقيل ح و حدثنا ابن أبي عمر وعبد بن حميد قالا حدثنا عبد الرزاق أخبرنا معمر كلهم عن الزهري بهذا الإسناد نحو حديث عمرو بن الحارث

مسلم 4208صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Muslim
Book
Bequests
Chapter
A man's bequest written with him
Numbering
Darussalam 4208
Muslim 4208