(1) باب الْكَرَاهِيَةِ فِي تَأْخِيرِ الْوَصِيَّةِ
It was narrated from Ibn 'Umar that the Messenger of Allah said:
"It is not befitting for a Muslim who has anything concerning which a will should be made, to abide for two nights without having a written will with him."
Reference: Sunan an-Nasa'i 3616
In-book reference: Book 30, Hadith 6
English translation: Vol. 4, Book 30, Hadith 3646