1 verse has
“infalível”
in Edition Samir El-Hayek / Fussilat (Explained in detail)
41:8Sabei que os fiéis, que praticam o bem, obterão uma recompensa infalível.
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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