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Sahih Bukhari
كِتَاب الطَّلَاقِ
The Book of Divorce
10. بَابُ إِذَا قَالَ لاِمْرَأَتِهِ وَهْوَ مُكْرَهٌ هَذِهِ أُخْتِي. فَلاَ شَيْءَ عَلَيْهِ:
(10) Chapter. If, under compulsion somebody says about his wife, “She is my sister.” there is no blame on him.