Prayer callus

A prayer callus, zabiba or zebiba (Arabic: زبيبة zabība, "raisin") is a callus on the forehead present in some devout praying Muslims, mainly in Egypt. Owing to its societal significance it is also known as the "devout sign". Among notable Egyptian leader Anwar Sadat's reputation for personal piety was evidenced by a callus on his forehead from repeated prostration in prayer.Islam requires its adherents to pray five times a day (known as salat), which involves kneeling on a prayer mat and touching the ground (or a raised piece of clay called turbah by the Shia) with one's forehead. When done firmly for extended periods of time, a callus – the "prayer bump" – can develop on the forehead which may be considered as a sign of piety and dedication. It is mentioned in the Quran as: Muḥammad is the Messenger of Allah; and those with him are forceful against the disbelievers...