1 verse has
“firmly”
in Edition Clear Qur'an by Talal Itani / Az-Zukhruf (Ornaments of gold)
43:13That you may mount their backs, and remember the favor of your Lord as you sit firmly upon them, and say, “Glory be to Him Who placed these at our service; surely we could not have done it by ourselves.
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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