Punishment of Disbelievers at War with Allah and His Apostle

Bukhari :: Book 8 :: Volume 82 :: Hadith 823

Narrated Abu Huraira:

The Prophet said, "If a lady slave commits illegal sexual intercourse and she is proved guilty of illegal sexual intercourse, then she should be flogged (fifty stripes) but she should not be admonished; and if she commits illegal sexual intercourse again, then she should be flogged again but should not be admonished; and if she commits illegal sexual intercourse for the third time, then she should be sold even for a hair rope."

Source materials are from the University of Southern California MSA site
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