Musnad Ahmad 26:390

Yahya ibn Sa'id narrated to us, from Ibn 'Ajlan, who said: 'Awn ibn 'Abdullah narrated to me, saying: 'Abdullah said: "When you are narrated a hadith from the Messenger of Allah, may Allah bless him and grant him peace, then think of the Messenger of Allah, may Allah bless him and grant him peace, as that which is most suitable, most guided, and most pious."