Masruq (may Allah have mercy on him) was asked about the verse: "And [also prohibited to you are] the mothers of your wives," so he said: "This is an absolute prohibition. Therefore, leave ambiguous what Allah has left ambiguous, and follow what He has made clear. Allah has allowed leniency in the case of a stepdaughter if her mother has not been consummated with, but He has made the stepmother absolutely forbidden in all circumstances."
Hadith Referenceسنن سعید بن منصور / كتاب التفسير / 604
Hadith Gradingمحدثین:سنده صحيح
Hadith Takhrij«أخرجه سعيد بن منصور فى (سننه) برقم: 604، وعبد الرزاق فى (مصنفه) برقم: 10813»