Sayyiduna Ka'b bin Malik (may Allah be pleased with him) said: I said: O Messenger of Allah! What do you say about poetry? The Messenger of Allah (peace and blessings be upon him) said: "The believer strives (in jihad) with his sword and his tongue. By the One in whose Hand is my soul, it is as though you are riddling them with arrows."
Hadith Referenceالمعجم الكبير للطبراني / باب الكاف / 16202