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The promise of Allahu ta’ālā (wa'da'llāhi is the verbal noun substituting for the [full] verbal construction; it is actually wa'adahumu'llāhu al-nasr, 'Allahu ta’ālā promised them victory'). Allahu ta’ālā does not fail His promise, of such [help], but most people, namely, the disbelievers of Mecca, are not aware, of His promise to help them [to victory].