فَرِحَ ٱلْمُخَلَّفُونَ بِمَقْعَدِهِمْ خِلَـٰفَ رَسُولِ ٱللَّهِ وَكَرِهُوٓا۟ أَن يُجَـٰهِدُوا۟ بِأَمْوَٰلِهِمْ وَأَنفُسِهِمْ فِى سَبِيلِ ٱللَّهِ وَقَالُوا۟ لَا تَنفِرُوا۟ فِى ٱلْحَرِّ ۗ قُلْ نَارُ جَهَنَّمَ أَشَدُّ حَرًّا ۚ لَّوْ كَانُوا۟ يَفْقَهُونَ

At-Tawbah — Ayah 81

The Repentance · التوبة · 9:81

Those who were left behind were happy with their sitting back to the displeasure of the Messenger of Allah, and they disliked carrying out Jihād in the way of Allah with their wealth and lives, and they said, “Do not march in this hot weather.” Say, “The fire of Jahannam is much more intense in heat,” only if they could understand.

Translation: Mufti Taqi Usmani