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The "parable" (mathal) of these two women implies, firstly, that even the most intimate relationship with a truly righteous person - even though he be a prophet - cannot save an unrepentant sinner from the consequences of his sin; and, secondly, that a true believer must cut himself off from any association with "those who are bent on denying the truth" even if they happen to be those nearest and dearest to him (cf.{ll:46}).
Lit., "and both betrayed them", i.e., their respective husbands. The story of Lot's wife and her spiritual betrayal of her husband is mentioned in the Qur'an in several places; see, in particular, note [66] on 7:83 and note [113] on 11:81 . As regards Noah's wife, the above is the only explicit reference to her having betrayed her husband; it would seem, however, that the qualification of "those on whom [God's] sentence has already been passed" in 11:40 applies to her no less than to her son (whose story appears in {11:42-47}).
Both wives were disbelievers. Noah’s wife used to give away the identity of the new believers so the disbelievers could persecute them. And Lot’s wife used to tell the men about her husband’s handsome male visitors so they could approach them.
Read Noah's story in xi. 36-48. Evidently his contemporary world had got so corrupt that it needed a great Flood to purge it. "None of the people will believe except those who have believed already. So grieve no longer over their evil deeds." But there were evil ones in his own family. A foolish and undutiful son is mentioned in xi. 42-46. Poor Noah tried to save him and pray for him as one "of his family"; but the answer came: "he is not of thy family; for his conduct is unrighteous". We might expect such a son to have a mother like him, and here we are told that it was so. Noah's wife was also false to the standards of her husband, and perished in this world and in the Hereafter.
The wife of Lot has already been mentioned more than once. See xi. 81, and n. 1577; vii. 83, and n. 1051; etc. The world around her was wicked, and she sympathised with and followed that wicked world, rather than her righteous husband. She suffered the fate of her wicked world.
"Betrayed their husbands": not in sex, but in the vital spiritual matters of truth and conduct. They had the high privilege of the most intimate relationship with the noblest spirits of their age: but if they failed to rise to the height of their dignity, their relationship did not save them. They could not plead that they were the wives of pious husbands. They had to enter Hell like any other wicked women. There is personal responsibility before Allah. One soul cannot claim the merits of another, any more than one pure soul can be injured by association with a corrupt soul. The pure one should keep its purity intact. See the next two examples.