Ubaid'h bin Hameed عبيدة بن حميد · The Book of Purification

"The Messenger of Allah (ﷺ) said: 'Whoever does not trim his mustache, he is not from one of us.'"

"I was one who had a lot of prostatic discharge, and the Messenger of Allah (ﷺ) said to me: 'If you see Madhi (prostatic fluid) then wash your penis and perform Wudu' like that for Salah, but if you ejaculate semen, then perform Ghusl.'"

"The Messenger of Allah (ﷺ) and I used to perform Ghusl together using one vessel."