1 verse has
“truthful”
in Edition Clear Qur'an by Talal Itani / Al-Qasas (The Stories)
28:49Say, “Then bring a scripture from God, more conductive to guidance than both, and I will follow it, if you are truthful.”
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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