Narrated Jabir (RA):

Allah's Messenger (ﷺ) said: "Any slave who marries without the permission of his masters or owners is (like) a fornicator." [Reported by Ahmad, Abu Dawud, an-Nasa'i and at-Tirmidhi; the latter graded it Sahih (authentic), as did Ibn Hibban].

وَعَنْ جَابِرٍ قَالَ : قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ أَيُّمَا عَبْدٍ تَزَوَّجَ بِغَيْرِ إِذْنِ مَوَالِيهِ أَوْ أَهْلِهِ , فَهُوَ عَاهِرٌ } رَوَاهُ أَحْمَدُ , وَأَبُو دَاوُدَ , وَاَلتِّرْمِذِيُّ وَصَحَّحَهُ , وَكَذَلِكَ اِبْنُ حِبَّانَ [1]‏ .‏