Bismillah Walhamdulillah Was Salaatu Was Salaam ‘ala Rasulillah
Narrated Abdullah bin Umar (Radi-Allahu ‘anhu):
Allah’s Apostle (Sallallahu ‘Alaihi Wa Sallam) said, “It is not permissible for any Muslim who has something to will to stay for two nights without having his last will and testament written and kept ready with him.”
Bukhari Vol. 4 : No. 1