Sayyiduna Ibn Mas'ud (may Allah be pleased with him) was asked about this verse: "What they withheld will be made a collar around their necks on the Day of Resurrection" [Surah Al Imran: 180], and he said: "He will be collared with a bald serpent that will keep pecking at his head."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9090