Is hijab wajib (obligatory) for a slave woman?

In this article in Arabic, it is said that Ibn Taymiyyah and Ibn Al Qayyim hold the opinion that the hijab is fard (obligatory) for free women only: > ذكر شيخ الإسلام ابن تيمية في تفسير سورة النور أن الحجاب **مختص بالحرائر دون الإماء**، كما كانت سنة المؤمنين في زمن النبي صلى الله عليه وسلم وخلفائه أن الحرة تحتجب والأمة تبرز. It is mentioned that they used the this hadith (english translation on sunnah.com ) from Sahih Al Bukhari as evidence too: > فَقَالُوا إِنْ حَجَبَهَا فَهْىَ مِنْ أُمَّهَاتِ الْمُؤْمِنِينَ، وَإِنْ لَمْ يَحْجُبْهَا فَهْىَ مِمَّا مَلَكَتْ يَمِينُهُ They said, if the Prophet makes her wear hijab, then she is the Prophet's wife but if he does not make her wear hijab, then she is a slave girl. *Notice, I translated the part of the hadith how they would interpret it.* I also find similar interpretations in the tafsirs, for instance: > { ذلكَ أدْنَى أنْ يُعْرَفْنَ فَلا يُؤْذَيْنَ } وقد كانت الـمـملوكة إذا مرّت تناولوها بـالإيذاء، فنهى الله الـحرائر أن يتشبهن بـالإماء. Source **Is the hijab obligatory for slave women too?** Which schools/scholars hold this opinion? And which doesn't? What is the majority view? Please provide references. ---------- I noticed the question "Can a slave woman show herself to her master? ", but this question is restricted to her master while my question is more general. *Feel free to edit and translate the Arabic parts.*