Sayyiduna Abu al-Darda' (may Allah be pleased with him) and Sayyiduna Utbah bin Abd (may Allah be pleased with him) both narrate: the Prophet (peace and blessings be upon him) said: "That the belly of one of you be filled with pus is better than that it be filled with poetry."
Al-Tabarani recorded it. Its chain contains Bishr bin Umarah, and he is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأدب / 13307