Sunan Ibn Majah

It was narrated from Ibn 'Abbas that:He came to Ubayy bin Ka'b accompanied by 'Umar. Ubayy came out to them and said: ""I noticed some prostatic fluid, so I washed my penis and performed ablution. 'Umar said: ""Is that sufficient?"" He said: ""Yes."" He ('Umar) asked: ""Did you hear that from the messenger of Allah?"" He said: ""Yes