Those who were left behind (in the Tabûk expedition because of their making false excuses) rejoiced in their staying (at home) behind the Messenger of Allâh. They found it hard to strive with their possessions and their persons in the cause of Allâh. And they said (one to another), `Go not forth to fight in the heat.' Say, `The fire of Gehenna is even more intense in heat.' If only they could understand (it).