1 verse has
“painful”
in Edition Clear Qur'an by Talal Itani / Al-Mujaadila (The Pleading Woman)
58:4But whoever cannot find the means must fast for two consecutive months before they may touch one another. And if he is unable, then the feeding of sixty needy people. This, in order that you affirm your faith in God and His Messenger. These are the ordinances of God. The unbelievers will have a painful punishment.
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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