1 verse has
“harder”
in Edition Clear Qur'an by Talal Itani / Al-Israa (The Night Journey)
17:51Or some substance, which, in your minds, is even harder.” Then they will say, “Who will restore us?” Say, “The One who originated you the first time.” Then they will nod their heads at you, and say, “When will it be?” Say, “Perhaps it will be soon.”
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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