the Prophet ﷺ said: "There are four kinds of women for whom there is no Li'an: a Christian woman married to a Muslim, a Jewish woman married to a Muslim, a free woman married to a slave, and a slave woman married to a free man." (Using translation from Ibn Mājah 2071)
"أربعٌ من النِّساءِ لا مُلاعنةَ بينهُنَّ، النصرانيةُ تحْت المسلم، واليهوديةُ تحتَ المُسلم، والحرة تَحتَ المملوك، والمملوكةُ تحت الحُرّ".