[Machine] To his wife, you are divorced if you go out until nightfall. So his wife went out, or he said that about his servant, so his servant went out before nightfall without his knowledge. His wife was divorced and his servant was freed because he left out the exception if he wanted to say "with my permission", but he neglected to include the exception. So his neglect of the exception is on him.  

لِامْرَأَتِهِ أَنْتِ طَالِقٌ إِنْ خَرَجْتِ حَتَّى اللَّيْلِ فَخَرَجَتِ امْرَأَتُهُ أَوْ قَالَ ذَلِكَ فِي غُلَامِهِ فَخَرَجَ غُلَامُهُ قَبْلَ اللَّيْلِ بِغَيْرِ عِلْمِهِ طُلِّقَتِ امْرَأَتُهُ وَعَتَقَ غُلَامُهُ لِأَنَّهُ تَرَكَ أَنْ يَسْتَثْنِيَ لَوْ شَاءَ قَالَ بِإِذْنِي وَلَكِنَّهُ فَرَّطَ فِي الِاسْتِثْنَاءِ فَإِنَّمَا يُجْعَلُ تَفْرِيطُهُ عَلَيْهِ