Sunan At-Tirmidhi

Narrated Ibn 'Umar:""The Messenger of Allah (ﷺ) said: 'I saw that I was brought a cup of milk, so I drank from it, and I gave my leftover to 'Umar bin Al-Khattab.' They said: 'So what did you interpret it as O Messenger of Allah?' He said: '(It is) Knowledge