"I asked Ibn Abi Awfa: 'Did the Messenger of Allah leave a will?' He said: 'No.' I said: 'How come it is prescribed for the Muslims to make wills?' He said: 'He left instructions urging the Muslims to adhere to the Book of Allah.'" (Using translation from Nasāʾī 3620)
سَأَلْتُ ابْنَ أَبِي أَوْفَى أَوْصَى رَسُولُ اللهِ ﷺ؟ قَالَ لَا قُلْتُ كَيْفَ كَتَبَ عَلَى الْمُسْلِمِينَ الْوَصِيَّةَ؟ قَالَ أَوْصَى بِكِتَابِ اللهِ