Narrated Abu Juhaifa (RA): I saw Bilal calling for prayer and I would follow (looking at) his mouth (as he turned it) this (right) side and that (left) side with his fingers in his ears. [Reported by Ahmad and at-Tirmidhi who graded it Sahih (authentic)] . In a narration of Ibn Majah - 'and he put his fingers in his ears'. And also a narration of Abu Dawud - 'he turned his neck to the right and left when he reached Haiya 'alas-Salah (Come to the prayer) and did not turn his body'. And its basic meaning is in Sahihain (al-Bukhari and Muslim).