(1) باب الْكَرَاهِيَةِ فِي تَأْخِيرِ الْوَصِيَّةِ
It was narrated from Salim bin 'Abdullah, from his father, that the Messenger of Allah said:
"It is not right for a Muslim who has anything concerning which a will should be made, to abide for more than three nights without having a written will with him."
Reference: Sunan an-Nasa'i 3619
In-book reference: Book 30, Hadith 9
English translation: Vol. 4, Book 30, Hadith 3649