(1) باب الْكَرَاهِيَةِ فِي تَأْخِيرِ الْوَصِيَّةِ
It was narrated that Ibn 'Umar said:
"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.'" (ES)
Reference (ES): Sunan an-Nasa'i 3615 (ES)
In-book reference (ES): Book 30, Hadith 5 (ES)
English translation (ES): Vol. 4, Book 30, Hadith 3645 (ES)