What is the basis for prohibiting combining a woman with her paternal or maternal aunt?

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The prohibition of combining a woman with her paternal or maternal aunt is established by the Sunnah: "A woman shall not be married concurrently with her paternal aunt, nor with her maternal aunt," and further specified: "A woman shall not be married alongside her paternal aunt, nor the paternal aunt alongside the daughter of her brother, nor a woman alongside her maternal aunt, nor the maternal aunt alongside the daughter of her sister." The underlying reason for prohibiting combining sisters is to prevent enmity between relatives which leads to the severing of kinship ties, a prohibited act. This rationale extends to paternal and maternal aunts, whether they are actual relatives or established through fosterage, near or far, as combining them causes the same enmity and potential severing of close kinship ties due to inherent jealousy between co-wives.