2 verses have
“letter”
in Edition Clear Qur'an by Talal Itani / An-Naml (The Ant)
27:28Go with this letter of mine, and deliver it to them; then withdraw from them, and see how they respond.”
27:29She said, “O Counselors, a gracious letter was delivered to me.
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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