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Lit., "lest We obliterate the faces" - i.e., that towards which one turns, or that which one faces, with expectation ('Abduh in Manar V, 144 ff.) - "and bring them back to their ends". It is to be noted that the term dubur (of which adbar is the plural) does not always signify the "back" of a thing - as most of the translators assume - but often stands for its "last part" or "end" (cf. Lane III, 846).
This is an allusion to the story of the Sabbath-breakers (lit., "the people of the Sabbath") referred to in 2:65 and fully explained in {7:163-166}.
See 7:163-165.
Literally, "before We obliterate some features (or faces) and turn them front to back (or back to front)": an Arabic idiom, which must be translated freely to yield its proper meaning in English. The face is the chief expression of a man's own real essence; it is also the index of his fame and estimation. The People of the Book had been specially favoured by Allah with revelations. If they proved themselves unworthy, they lost their "face". Their eminence would, owing to their own conduct, be turned into degradation. Others would take their place. The first shall be last and the last shall be first: Matt. xix. 30.
Cf. ii. 65 and n. 79.