1 verse has
“ثقيلا”
in Edition Simple Clean / Al-Insaan (Man)
27:76إن هؤلاء يحبون العاجلة ويذرون وراءهم يوما ثقيلا
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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