"It is not right for a Muslim who has anything concerning which a will should be made, to abide for more than three nights without having a written will with him." (Using translation from Nasāʾī 3619)
عَنْ رَسُولِ اللهِ ﷺ قَالَ «مَا حَقُّ امْرِئٍ مُسْلِمٍ لَهُ شَيْءٌ يُوصَى فِيهِ يَبِيتُ ثَلَاثَ لَيَالٍ إِلَّا وَوَصِيَّتُهُ عِنْدَهُ مَكْتُوبَةٌ»