Sayyiduna Ibn Abbas (may Allah be pleased with them both) followed this reading of the verse: "Arrogant about it, conversing by night, talking obscenities" [Al-Mu'minun: 67], and said: "The polytheists used to lampoon (speak ill of) the Messenger of Allah (peace and blessings be upon him) in their poetry."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11043