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The Spacious House within the Dwelling

Scholars have said that if one sees a spacious, mud-plastered house within their dwelling that wasn't there before, it may refer to a righteous woman who practices asceticism in that dwelling. If the house is plastered or built with bricks, it may signify an insolent and hypocritical woman. A dark house is interpreted as a woman of bad character, and if a woman sees it, then it is a man of similar character.

Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam