Yūsuf b. Asbāt – Allah have mercy on him – reports that whenever Sufyān remembered the hereafter he would urinate blood.
It is also reported that Sufyān – Allah have mercy on him – said:
I sometimes see something I feel I am obliged to speak out about, but when I don’t say anything I urinate blood.
And in another report:
I sometimes see an evil being done, but if I don’t speak out about it I urinate blood.
Al-Dhahabī , Siyar A’lām Al-Nubalā` in his biography of Imām Sufyān Al-Thawrī .