Ibn ‘Umar reported the Prophet (ﷺ) as saying “If a slave marries without the permission of his master, his marriage is null and void.

Abu Dawud said “This tradition is weak. This is mauquf(does not go back to the Prophet). This is the statement of the Ibn ‘Umar himself.
Sunan Abi Dawud Book 12, Hadith 34
← Previous Hadith The Prophet (ﷺ) said: If any slave marries without the permission of his masters, he is a fornicator.

Sunan Abi Dawud Book 12, Hadith 33 Next Hadith → Abu Hurairah reported the Apostle of Allaah(ﷺ) as saying “ A man should not seek the hand of a woman in marriage when his brother has already sought her hand.”

Sunan Abi Dawud Book 12, Hadith 35