أَبُو عَلِيٍّ الْأَشْعَرِيُّ عَنْ مُحَمَّدِ بْنِ عَبْدِ الْجَبَّارِ عَنْ صَفْوَانَ عَنْ سَيْفٍ التَّمَّارِ قَالَ قُلْتُ لِأَبِي عَبْدِ اللَّهِ ( عليه السلام ) الرَّجُلُ يَقُولُ لِامْرَأَتِهِ أَنْتِ عَلَيَّ كَظَهْرِ أُخْتِي أَوْ عَمَّتِي أَوْ خَالَتِي قَالَ فَقَالَ إِنَّمَا ذَكَرَ اللَّهُ الْأُمَّهَاتِ وَ إِنَّ هَذَا لَحَرَامٌ .
18. Abu Ali al-Ash‘ariy has narrated from Muhammad ibn ‘Abd al-Jabbar from Safwan from Sayf al-Tammar who has said the following: “I once asked abu ‘ Abd Allah , about the case of a man who says to his wife, ‘You are like the back of my sister, maternal or paternal aunt.’ He (the Imam) said, ‘Allah has mentioned the mothers, this certainly is unlawful. ’” 