Surah 15. Al-Hijr, Ayah 70

Lit., "all people" (al-'alamin): obviously, because Lot was a stranger in Sodom - having come there from Mesopotamia, his and Abraham's country of origin (see surah {11}, note [102]) - and had previously aroused the ire of the Sodomites by his moral reproaches (cf. {7:80-82}).

I understand the meaning to be that Lot, the only righteous man in the City, had frequently remonstrated with the inhabitants against their unnatural crimes, and they had forbidden him to speak to them again on behalf of any one, "as if" (they might tauntingly say) "he was the protector of all and sundry." Some Commentators understand the verse to mean: 'Did we not forbid thee to entertain any strangers?'