عَنْ اِبْنِ عُمَرَ رَضِيَ اَللَّهُ عَنْهُمَا ;
أَنَّ رَسُولَ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «مَا حَقُّ اِمْرِئٍ مُسْلِمٍ لَهُ شَيْءٌ يُرِيدُ أَنْ يُوصِيَ فِيهِ يَبِيتُ لَيْلَتَيْنِ إِلَّا وَوَصِيَّتُهُ مَكْتُوبَةٌ عِنْدَهُ»
The Messenger of Allah (sallallahu alayhi wa sallam) said: “It is not permissible for a Muslim person, who has something he wants to give as a bequest, to have it for two nights without having his will regarding it written and kept ready with him.”.
Bulugh al-Maram 1111, Book 7, Business Transactions, Hadith 222. 1 min read