Bashir bin Abdur Rahman bin Ka'b bin Malik narrates that Sayyiduna Ka'b bin Malik (may Allah be pleased with him) used to narrate that the Messenger of Allah (peace and blessings be upon him) said: "By the One in whose Hand is my soul, it is as though you are riddling them with arrows" (regarding the poetry that the poet would say against them).
Hadith Referenceالمعجم الكبير للطبراني / باب الكاف / 16203