Musnad Ahmad 662:1

Rawh narrated to us, Qurrah ibn Khalid narrated to us, from Dharghamah ibn Ulaybah ibn Harmalah al-Anbari, who said: My father narrated to me, from his father, who said: I came to the Messenger of Allah, may Allah bless him and grant him peace, and said: "O Messenger of Allah, advise me." He said: "Fear Allah. And if you are in a gathering and you stand up from it, and you hear them saying what pleases you, then come to it (join them). And if you hear them saying what you dislike, then leave it."