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YUSUFALI : (It is) the promise of Allah. Never does Allah depart from His promise: but most men understand not.

PICKTHAL : It is a promise of Allah. Allah faileth not His promise, but most of mankind know not.

SHAKIR : (This is) Allah's promise! Allah will not fail His promise, but most people do not know.

M& HILALI : (It is) a Promise of Allah (i.e. Allah will give victory to the Romans against the Persians), and Allah fails not in His Promise, but most of men know not.