Aya number 81 of surat At-Taubah
بِسْمِ اللَّهِ الرَّحْمَٰنِ الرَّحِيمِ
فَرِحَ الْمُخَلَّفُونَ بِمَقْعَدِهِمْ خِلَافَ رَسُولِ اللَّهِ وَكَرِهُوا أَنْ يُجَاهِدُوا بِأَمْوَالِهِمْ وَأَنْفُسِهِمْ فِي سَبِيلِ اللَّهِ وَقَالُوا لَا تَنْفِرُوا فِي الْحَرِّ قُلْ نَارُ جَهَنَّمَ أَشَدُّ حَرًّا لَوْ كَانُوا يَفْقَهُونَ [٨١]
Translation: English - Sahih International
Those who remained behind rejoiced in their staying [at home] after [the departure of] the Messenger of Allah and disliked to strive with their wealth and their lives in the cause of Allah and said, 'Do not go forth in the heat." Say, "The fire of Hell is more intensive in heat" - if they would but understand.
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