Never laughing at another’s expense
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Etiquette of Laughing & Smiling
Never laughing at another's expense
"O you who believe, let not a people ridicule [another] people; perhaps they may be better than them."
Reference: Qur'an, Surah Al-Hujurat 49:11
Explanation
Laughter that comes from mocking or belittling someone else falls outside this etiquette entirely.