1 verse has
“relentlessly”
in Edition Clear Qur'an by Talal Itani / Al-A'raaf (The Heights)
7:202But their brethren lead them relentlessly into error, and they never stop short.
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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