1 verse has
“hierro”
in Edition Julio Cortes / Al-Israa (The Night Journey)
17:50Di: «Aunque seáis piedra, hierro
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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