"The Messenger of Allah came to visit me while I was sick. He said: 'Do you have a will?' I said: 'Yes.' He said: 'For how much?' I said: 'All of my wealth, for the cause of Allah.' He said: 'What did you leave for your children?'" He (Sa'd) said: "They are rich in goodness.' He said: 'Will a tenth.'" He (Sa'd) said: "He (pbuh) continued decreasing it until he said: 'Will a third, and a third is too great.'" (One of the narrators:) Abdur-Rahman said: "We considered it recommended that it be less than a third, since the Messenger of Allah said: 'And a third is too great.'"  

عَادَنِي رَسُولُ اللَّهِ ﷺ وَأَنَا مَرِيضٌ فَقَالَ أَوْصَيْتَ قُلْتُ نَعَمْ قَالَ بِكَمْ قُلْتُ بِمَالِي كُلِّهِ فِي سَبِيلِ اللَّهِ قَالَ فَمَا تَرَكْتَ لِوَلَدِكَ قُلْتُ هُمْ أَغْنِيَاءُ بِخَيْرٍ قَالَ أَوْصِ بِالْعُشْرِ فَمَا زِلْتُ أُنَاقِصُهُ حَتَّى قَالَ أَوْصِ بِالثُّلُثِ وَالثُّلُثُ كَثِيرٌ قَالَ أَبُو عَبْدِ الرَّحْمَنِ وَنَحْنُ نَسْتَحِبُّ أَنْ يَنْقُصَ مِنَ الثُّلُثِ لِقَوْلِ رَسُولِ اللَّهِ ﷺ وَالثُّلُثُ كَثِيرٌ قَالَ وَفِي الْبَابِ عَنِ ابْنِ عَبَّاسٍ  

"The Messenger of Allah visited me when I was sick, and said: 'Have you made a will?' I said: 'Yes.' He said: 'How much?' I said: 'For all my wealth to be given in the cause of Allah.' He said: 'What have you left for your children?' I said: 'They are rich (independent of means).' He said: 'Bequeath one-tenth.' And we kept discussing it until he said: 'Bequeath one-third, and one-third is much or large.'" (Using translation from Nasāʾī 3631)  

عَادَنِي رَسُولُ اللهِ ﷺ فِي مَرَضِي فَقَالَ «أَوْصَيْتَ؟» قُلْتُ نَعَمْ قَالَ «بِكَمْ؟» قُلْتُ بِمَالِي كُلِّهِ فِي سَبِيلِ اللهِ قَالَ «فَمَا تَرَكْتَ لِوَلَدِكَ؟» قُلْتُ هُمْ أَغْنِيَاءُ قَالَ «أَوْصِ بِالْعُشْرِ» فَمَا زَالَ يَقُولُ وَأَقُولُ حَتَّى قَالَ «أَوْصِ بِالثُّلُثِ وَالثُّلُثُ كَثِيرٌ أَوْ كَبِيرٌ»