I asked ʿAbdullah bin Abu ʿAufa "Did the Prophet ﷺ make a will?" He replied, "No," I asked him, "How is it then that the making of a will has been enjoined on people, (or that they are ordered to make a will)?" He replied, "The Prophet ﷺ bequeathed Allah's Book (i.e. Qur'an).  

سَأَلْتُ عَبْدَ اللَّهِ بْنَ أَبِي أَوْفَى ؓ هَلْ كَانَ النَّبِيُّ ﷺ أَوْصَى فَقَالَ لاَ فَقُلْتُ كَيْفَ كُتِبَ عَلَى النَّاسِ الْوَصِيَّةُ أَوْ أُمِرُوا بِالْوَصِيَّةِ قَالَ أَوْصَى بِكِتَابِ اللَّهِ  

“I said to Abdullah bin Abu Awfa: 'Did the Messenger of Allah ﷺ make a will concerning anything?' He said: 'No.' I said: 'How come he told the Muslims to make wills?' He said: 'He enjoined (them to adhere to) the book of Allah (SWT).” Malik said: “Talhah bin Musarrif said: 'Huzail bin Shurahbil said: “Abu Bakr was granted leadership according to the will of Messenger of Allah ﷺ?” (Rather) Abu Bakr wished that the found a covenant (in that regard) from Messenger of Allah ﷺ, so he could fetter his nose with a (camel's) nose ring.”  

قُلْتُ لِعَبْدِ اللَّهِ بْنِ أَبِي أَوْفَى أَوْصَى رَسُولُ اللَّهِ ﷺ بِشَىْءٍ قَالَ لاَ قُلْتُ فَكَيْفَ أَمَرَ الْمُسْلِمِينَ بِالْوَصِيَّةِ قَالَ أَوْصَى بِكِتَابِ اللَّهِ قَالَ مَالِكٌ وَقَالَ طَلْحَةُ بْنُ مُصَرِّفٍ قَالَ الْهُزَيْلُ بْنُ شُرَحْبِيلَ أَبُو بَكْرٍ كَانَ يَتَأَمَّرُ عَلَى وَصِيِّ رَسُولِ اللَّهِ ﷺ وَدَّ أَبُو بَكْرٍ أَنَّهُ وَجَدَ مِنْ رَسُولِ اللَّهِ ﷺ عَهْدًا فَخَزَمَ أَنْفَهُ بِخِزَامٍ