The Messenger of Allah ﷺ as saying: It is the duty of a Muslim man who has something which is to be given as bequest not to have it for two nights without having his will written regarding it. (Using translation from Abū Dāʾūd 2862)  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «مَا حَقُّ امْرِئٍ مُسْلِمٍ يَبِيتُ لَيْلَتَيْنِ وَلَهُ شَيْءٌ يُوصِي فِيهِ إِلَّا وَوَصِيَّتُهُ مَكْتُوبَةٌ عِنْدَهُ»  

[Machine] "The believer does not eat until his stomach is completely full, and his conscience remains under his control."  

«الْمُؤْمِنُ لَا يَأْكُلُ فِي كُلِّ بطنه وَلَا تَزَالُ وَصِيَّتُهُ تَحْتَ جَنْبِهِ»