An-Nisa · 4:15

15. For those of your women who commit sexual offences – whether they are married or unmarried – call four trustworthy Muslim men witnesses. If they bear witness against them, then confine them to their homes as a punishment, until the end of their lives, or until Allah makes a way for them other than being confined. The ruling of this verse was replaced with the ruling that unmarried women who have illicit sexual relations should be whipped a hundred times and banished for a year, and married women who have illicit sexual relations should be stoned.