regarding the meaning of the saying of Allah the Exalted: “...and your sisters through breastfeeding...”
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The questioner : about the meaning of the saying of Allah the Exalted: [An-Nisa 4:23]
The Shaykh : The benefit is to make it clear that a sister from the father is forbidden, so that no one might say that the forbidden relatives are only those from the mother’s side, as some scholars have said. For example, if someone says, “Your mother through breastfeeding has no effect in breastfeeding except for the mother and what branches from her,” then when it is stated, “your sisters from her,” the benefit is that a sister from the father through breastfeeding is forbidden.
your sisters through nursing
... أخواتكم من الرضاعة ...The Shaykh : The benefit is to make it clear that a sister from the father is forbidden, so that no one might say that the forbidden relatives are only those from the mother’s side, as some scholars have said. For example, if someone says, “Your mother through breastfeeding has no effect in breastfeeding except for the mother and what branches from her,” then when it is stated, “your sisters from her,” the benefit is that a sister from the father through breastfeeding is forbidden.