"They say that the Prophet ﷺ made a will for 'Ali,[1] but he called for a basin in which to urinate, then he went flaccid suddenly (and died), so how could he leave a will?!" The Shaikh said: Azhar (one of the narrators) is Ibn Sa'd As-Samman. [1] Meaning, appointing him as the Khalifah.  

يَقُولُونَ إِنَّ النَّبِيَّ ﷺ أَوْصَى إِلَى عَلِيٍّ لَقَدْ دَعَا بِالطَّسْتِ لِيَبُولَ فِيهَا فَانْخَنَثَتْ نَفْسُهُ وَمَا أَشْعُرُ فَإِلَى مَنْ أَوْصَى قَالَ الشَّيْخُ أَزْهَرُ هُوَ ابْنُ سَعْدٍ السَّمَّانُ