1 verse has
“wholeheartedly”
in Edition Clear Qur'an by Talal Itani / Al-Muzzammil (The Enshrouded One)
73:8So remember the Name of your Lord, and devote yourself to Him wholeheartedly.
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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