Musnad Ahmad 1024
It was narrated that ‘Ali (رضي الله عنه) said:
If I carried out the hadd punishment on a man and he died, I would not feel upset, except in the case of khamr; if (such a man) died, I would pay the diyah (to his family) because the Messenger of Allah (ﷺ) did not prescribe it (did not specify a particular number of lashes).
حَدَّثَنَا عَبْدُ الرَّحْمَنِ، عَنْ سُفْيَانَ، عَنْ أَبِي حَصِينٍ، عَنْ عُمَيْرِ بْنِ سَعِيدٍ، عَنْ عَلِيٍّ، رَضِيَ اللَّهُ عَنْهُ قَالَ مَا مِنْ رَجُلٍ أَقَمْتُ عَلَيْهِ حَدًّا فَمَاتَ فَأَجِدُ فِي نَفْسِي إِلَّا الْخَمْرَ فَإِنَّهُ لَوْ مَاتَ لَوَدَيْتُهُ لِأَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَمْ يَسُنَّهُ‏.‏