The Prophet ﷺ said: about a man who had (unlawful) intercourse with his wife's slave girl: If she made her lawful for him, he will be flogged one hundred lashes; if she did not make her lawful for him, I shall stone him. (Using translation from Abū Dāʾūd 4459)  

عَنِ النَّبِيِّ ﷺ فِي الرَّجُلِ يَأْتِي جَارِيَةَ امْرَأَتِهِ قَالَ «إِنْ كَانَتْ أَحَلَّتْهَا لَهُ جَلَدْتُهُ مِائَةً وَإِنْ لَمْ تَكُنْ أَحَلَّتْهَا لَهُ رَجَمْتُهُ»  

[Machine] Al-Nu'man, I have a clear news in that I received it from the Messenger of Allah ﷺ "If you had given him permission, I would have beaten him a hundred times, and if you had not given him permission, I would have stoned him."  

النُّعْمَانُ أَمَا إِنَّ عِنْدِي فِي ذَلِكَ خَبَرًا شَافِيًا أَخَذْتُهُ مِنْ رَسُولِ اللهِ ﷺ «إِنْ كُنْتِ أَذِنْتِ لَهُ ضَرَبْتُهُ مِائَةً وَإِنْ كُنْتِ لَمْ تَأْذَنِي لَهُ رَجَمْتُهُ»