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Surah At-Tawbah · 9:87
رَضُوا۟ بِأَن يَكُونُوا۟ مَعَ ٱلْخَوَالِفِ وَطُبِعَ عَلَىٰ قُلُوبِهِمْ فَهُمْ لَا يَفْقَهُونَ
“They preferred to stay behind with the helpless, and their hearts have been sealed so they do not comprehend.”
Reason for revelation & related events1
asbab al nuzul
Expedition
The Battle of Tabuk
~Rajab, 9 AH (late July / early August, per the lecture's reckoning)
Part of the well-established hypocrites-who-stayed-behind-from-Tabuk passage of Surat al-Tawbah.