9:81 fariHal mukhal-lafuuna bi maq'Adihim khilaafa rasuulil-laahi wa karihuu ay yujaahiduu bi amwaalihim wa anfusihim fiy sabiylil-laahi wa qaaluu laa tanfiruu fiyl Harr* qul naaru jahan-nama ashad-du Har-raa* law kaanuu yafqahuun

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Ahmed Raza Khan: Mohammed Aqib Qadri:
Those who were left behind rejoiced that behind the Noble Messenger of Allah they had remained seated, and they were unwilling to fight in Allah's cause with their lives or their wealth, and said "Do not venture out in the heat"; say, "The fire of hell is the hottest"; if only they understood!

Yusuf Ali:
Those who were left behind (in the Tabuk expedition) rejoiced in their inaction behind the back of the Messenger of Allah: they hated to strive and fight, with their goods and their persons, in the cause of Allah: they said, "Go not forth in the heat." Say, "The fire of Hell is fiercer in heat." If only they could understand!

Pickthal:
Those who were left behind rejoiced at sitting still behind the messenger of Allah, and were averse to striving with their wealth and their lives in Allah's way. And they said: Go not forth in the heat! Say: The fire of hell is more intense of heat, if they but understood.