Jabir reported that Allah's Messenger (ﷺ) sent a phystian to Ubayy b. Ka'b. He cut the vein and then cauterised it.
Sahih Muslim Book 39, Hadith 99
← Previous Hadith I think he (Abu Taiba) was her faster brother or a young boy before entering upon the adolescent period.

Sahih Muslim Book 39, Hadith 98 Next Hadith → A'mash reported this with the same chain of transmitters and he made no mention of the fact that he cut one of his veins.

Sahih Muslim Book 39, Hadith 100