It is not proper for a Muslim who has got something to bequeathe to spend even three nights without having his will written down with him regarding it. 'Abdullah b. 'Umar (Allah be pleased with them) said: Ever since I heard Messenger of Allah ﷺ say this I have not spent a night without having my will (written) along with me.  

أَنَّهُ سَمِعَ رَسُولَ اللَّهِ ﷺ قَالَ مَا حَقُّ امْرِئٍ مُسْلِمٍ لَهُ شَىْءٌ يُوصِي فِيهِ يَبِيتُ ثَلاَثَ لَيَالٍ إِلاَّ وَوَصِيَّتُهُ عِنْدَهُ مَكْتُوبَةٌ قَالَ عَبْدُ اللَّهِ بْنُ عُمَرَ مَا مَرَّتْ عَلَىَّ لَيْلَةٌ مُنْذُ سَمِعْتُ رَسُولَ اللَّهِ ﷺ قَالَ ذَلِكَ إِلاَّ وَعِنْدِي وَصِيَّتِي  

[Machine] I heard the Messenger of Allah ﷺ say, "No Muslim should have three nights pass by him without having his will with him."  

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ مَا حَقُّ امْرِئٍ مُسْلِمٍ تَمُرُّ عَلَيْهِ ثَلَاثُ لَيَالٍ إِلَّا وَوَصِيَّتُهُ عِنْدَهُ  

"It is not befitting for a Muslim to abide for three nights without having his will with him." 'Abdullah bin 'Umar said: "Since I heard this from the Messenger of Allah, I have always had my will with me." (Using translation from Nasāʾī 3618)  

أَنَّ النَّبِيَّ ﷺ قَالَ «مَا حَقُّ امْرِئٍ مُسْلِمٍ يَمُرُّ عَلَيْهِ ثَلَاثُ لَيَالٍ إِلَّا وَعِنْدَهُ وَصِيَّتُهُ» قَالَ عَبْدُ اللهِ بْنُ عُمَرَ مَا مَرَّتْ عَلَيَّ لَيْلَةٌ مُنْذُ سَمِعْتُ رَسُولَ اللهِ ﷺ قَالَ ذَلِكَ إِلَّا وَعِنْدِي وَصِيَّتِي  

[Machine] The Messenger of Allah ﷺ said, "It is not befitting for a Muslim to have something that he wishes to advise on and go to sleep for three nights without having his will written with him." Abdullah bin Umar (may Allah be pleased with him) said, "No night has passed since I heard the Messenger of Allah ﷺ say this, except that I have my will with me."  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ مَا حَقُّ امْرِئٍ مُسْلِمٍ لَهُ شَيْءٌ يُوصِي فِيهِ يَبِيتُ ثَلَاثَ لَيَالٍ إِلَّا وَوَصِيَّتُهُ مَكْتُوبَةٌ عِنْدَهُ قَالَ عَبْدُ اللهِ بْنُ عُمَرَ مَا مَرَّتْ عَلَيَّ لَيْلَةٌ مُنْذُ سَمِعْتُ رَسُولَ اللهِ ﷺ قَالَ ذَلِكَ إِلَّا وَعِنْدِي وَصِيَّتِي