2 verses have
“truthful”
in Edition Clear Qur'an by Talal Itani / Yunus (Jonas)
10:38Or do they say, “He has forged it”? Say, “Then produce a single chapter like it, and call upon whomever you can, apart from God, if you are truthful.”
10:48And they say, “When will this promise be fulfilled, 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