1 verse has
“solemne”
in Edition Julio Cortes / Al-Kahf (The Cave)
18:14Fortalecimos su ánimo cuando se levantaron y dijeron: «Nuestro Señor es el Señor de los cielos y de la tierra. No invocaremos a más dios que a Él. Si no, diríamos una solemne mentira.
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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