Sunan Ibn Majah, Chapter: The Book of the Sunnah

"Umar bin Al-Khattab sent us to Kufah, and he accompanied us as far as a place called Sirar. He said: 'Do you know why I walked with you?' We said: 'Because of the rights of the Companions of the Messenger of Allah (saw) and because of the rights of the Ansar.' He said: 'No, rather it is because of words that I wanted to say to you. I wanted you to memorize it due to my walking with you. You are going to people in whose hearts the Qur'an bubbles like water in a copper cauldron. When they see you, they will look up at you, saying: "The Companions of Muhammad (SAW)!" But do not recite many reports from the Messenger of Allah (saw), then I will be your partner." (Da'if)