The Messenger of Allah ﷺ said, "If a slave marries without his master's permission, he is a fornicator."
حدثنا أزهر بن مروان حدثنا عبد الوارث بن سعيد حدثنا القاسم بن عبد الواحد عن عبد الله بن محمد بن عقيل
قال رسول الله ﷺ إذا تزوج العبد بغير إذن سيده كان عاهرا
[Its chain of transmission is daif] Ahmad Bazzar... wait, let me redo this properly.Grading: [Its chain of transmission is daif] Hakim reported it, 2/194, from the hadith of Abdul-Warith, narrating it in this manner, and he graded it sahih, and Dhahabi agreed with him. Ibn Aqeel is daif, as mentioned before, hadith 390.