1 verse has
“formal”
in Edition Samir El-Hayek / Al-Qalam (The Pen)
68:39Ou possuís, acaso, a Nossa promessa formal, até ao Dia da Ressurreição, de conseguirdes tudo o que desejardes?
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Those who spend their wealth by night and day, privately and publicly, will receive their reward from their Lord. They have nothing to fear, nor shall they grieve.
The Holy Quran · Al-Baqara (The Cow) · 2:274