Surah 50. Qaf, Ayah 13

The term "brethren" (ikhwan) is used here metonymically, denoting a group of people who share the same views or, alternatively, the same environment. Since the people referred to formed Lot's social environment (cf. 7:83 or {11:77-83}), they are described as his "brethren" although his moral concepts and inclinations were entirely different from theirs.