Yûsuf b. Asbât – Allah have mercy on him – reports that whenever Sufyân remembered the hereafter he would urinate blood.
It is also reported that Sufyân – 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-Dhahabî , Siyar A’lâm Al-Nubalâ` in his biography of Imâm Sufyân Al-Thawrî .