Rasul Allah (sal Allahu alaihi wa sallam) said, “Whoever eats food obtained at the expense of a Muslim, Allah will feed him hellfire on Judgement Day. He who gains a prestigious reputation at the expense of a Muslim, Allah will reduce him to the position of the show-offs and boasters on Judgement Day. He who wears a garment acquired at the expense of a Muslim, Allah will dress him in a garment of fire on Judgement Day.”

 
[Al-Hakim]