(22) The Chapters on Wills
كتاب الوصايا
(2) Chapter: Exhortation To Make a Will
(2.00) باب الْحَثِّ عَلَى الْوَصِيَّةِ
Sunan Ibn Majah 2702 
It was narrated from Ibn 'Umar that the Prophet (ﷺ) said:
“The Muslim man has no right to spend two nights, if he has something for which will should be made, without having a written will with him.”
حَدَّثَنَا مُحَمَّدُ بْنُ مَعْمَرٍ، حَدَّثَنَا رَوْحُ بْنُ عَوْفٍ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏ "‏ مَا حَقُّ امْرِئٍ مُسْلِمٍ يَبِيتُ لَيْلَتَيْنِ وَلَهُ شَىْءٌ يُوصِي بِهِ إِلاَّ وَوَصِيَّتُهُ مَكْتُوبَةٌ عِنْدَهُ ‏"‏ ‏.‏
Grade :  Sahih (Darussalam)
Reference : Sunan Ibn Majah 2702
In-book reference : Book 22, Hadith 8
English translation : Vol. 3, Book 22, Hadith 2702