«ما حق امرئ مسلم له شيء يوصي فيه يبيت ثلاث ليال إلا ووصيته عنده مكتوبة»
The Prophet (peace and blessings be upon him) said:
"It is not right for a Muslim man who has something about which he wishes to make a bequest to spend three nights without having his will written down with him."
Hadith Referenceصحیح الجامع الصغیر / حرف الميم / 5615