Ahmad ibn Muhammad ibn Isa narrated from Abu Abdullah Al-Barqi, from Isma'il Al-Ju'fi. He said:
(Narrator said) "I saw Abu Ja'far عليه السلام praying while blood was flowing from his leg."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 272