Bulugh al-Maram 7 Business Transactions كتاب البيوع 222

عَنْ اِبْنِ عُمَرَ – رَضِيَ اَللَّهُ عَنْهُمَا- ; أَنَّ رَسُولَ اَللَّهِ – صلى الله عليه وسلم -قَالَ : { مَا حَقُّ اِمْرِئٍ مُسْلِمٍ لَهُ شَيْءٌ يُرِيدُ أَنْ يُوصِيَ فِيهِ يَبِيتُ لَيْلَتَيْنِ إِلَّا وَوَصِيَّتُهُ مَكْتُوبَةٌ عِنْدَهُ } مُتَّفَقٌ عَلَيْهِ 1 . 1 – صحيح . رواه البخاري ( 2738 ) ، ومسلم ( 1627 ).

Narrated Ibn ‘Umar (RA): Allah’s Messenger (صلى الله عليه وسلم) 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.” [Agreed upon].