Hadith 4707
Abdur Rahman bin Ka'b bin Malik narrates from his father: He said: O Messenger of Allah (peace be upon him)! What is your opinion about poetry? The Prophet (peace be upon him) said: A believer strives with his sword and his tongue. By Him in Whose hand is my soul, (by reciting poetry against the polytheists) it is as if you are striking them with spears.