Surah 14. Ibrahim, Ayah 50

According to Razi, the "garments of black pitch (qatiran)" and the "fire veiling their faces" are metaphors of the inexpressible suffering and loathsome horror which will enwrap the sinners' souls on the Day of Judgment. (See also surah {73}, note [7]

Sirbal,- plural, Sarabil,- a garment or coat of mail, breast plate; something covering the most vital parts of the body; like the shirt or the Indian kurta.

Qatiran: black pitch, a resinous substance exuding from certain kinds of trees like the terebinth or the pines, or distilled from wood or coal. It catches fire readily. Issuing from the upper garments (Sarabil) the flames soon cover the face, the most expressive part of man's essence or being. The metaphor of fetters (n. 1926) is now changed to that of pitch, which darkens and sets on fire the soul of man.