1 verse has
“harder”
in Edition Clear Qur'an by Talal Itani / Al-Baqara (The Cow)
2:74Then after that your hearts hardened. They were as rocks, or even harder. For there are some rocks from which rivers gush out, and others that splinter and water comes out from them, and others that sink in awe of God. God is not unaware of what you do.
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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