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Lit., "he was straitened as regards the reach of his arm in their behalf" - an idiomatic phrase often used in classical Arabic, denoting here Lot's utter inability to afford his guests protection from the people of Sodom, whose homosexual propensities have ever since been commemorated in the term "sodomy". Since Lot thought that the strangers were no more than handsome young men, he felt certain that they would be sexually assaulted by his sinful countrymen.
Since the angels came in the form of handsome men, Lot was worried for the dignity and safety of his guests among his people—not knowing that they were angels.
The story of Lot, as referred to in vii. 80-84, laid emphasis on the rejection of Lot's mission by men who practised unnatural abominations. See n. 1049 to vii. 80. Here the emphasis is laid on Allah's dealings with men-in mercy for true spiritual service and in righteous wrath and punishment for those who defy the laws of nature established by Him;-also on men's dealings with each other and the contrast between the righteous and the wicked who respect no laws human or divine.