Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates that the Messenger of Allah (peace and blessings be upon him) said: It is not appropriate for a Muslim who has something to bequeath, that he should spend two nights without having his will written down.
Hadith Referenceالمنتقى ابن الجارود / كتاب الطلاق / 946
Hadith Gradingغلام مصطفےٰ ظهير امن پوري:صحيح
Hadith Takhrijاز غلام مصطفےٰ ظهير امن پوري:«صحيح البخاري : 2738، صحيح مسلم : 1627۔»