It is narrated from Sayyiduna Samurah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Satan has a kohl and a lick (something to be licked). When he applies his kohl to a person, his eyes fall asleep to the remembrance of Allah, and when he makes him lick his lick, his tongue becomes sharp in speaking evil."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6825