Dr. Mustafa Khattab, the Clear Quran - Surah Al-Balad, ayah 19

Translation of Surah Al-Balad, ayah 19 (90:19)

وَٱلَّذِينَ كَفَرُواْ بِـَٔايَٰتِنَا هُمۡ أَصۡحَٰبُ ٱلۡمَشۡـَٔمَةِ ١٩
As for those who deny Our signs, they are the people of the left.1

Foot notes

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Other sûrahs describing the people of the right and the people of the left include 56 and 69.