Musnad Ahmad 8:68

Muhammad ibn Ja‘far narrated to us, Shu‘bah narrated to us, and Hajjaj narrated to me, Shu‘bah narrated to me, from Qatadah, from Yunus ibn Jubayr, from Muhammad ibn Sa‘d, from Sa‘d, from the Prophet, may Allah bless him and grant him peace, who said: "For the interior of one of you to be filled with pus that consumes him is better for him than for it to be filled with poetry." Hajjaj said: I heard Yunus ibn Jubayr.