Sunan an-Nasa'i, Volume 4, Book 26, Hadith 3384 (DarusSalam) ⓘ

It was narrated that Anas said: "The Prophet stayed between Khaibar and Al-Madinah for three days when he consummated his marriage to Safiyyah bint Huyayy, and I invited the Muslims to his Walimah, in which there was no bread or meat. He commanded that a leather cloth (be spread) and dates, cottage cheese and ghee were placed on it, and that was his Walimah. The Muslims said: '(Will she be) one of the Mothers of the Believers, or a female slave whom his right hand possesses?' They said: 'If he has a Hijab for her, then she will be one of the Mothers of the Believers and if she does not have a Hijab then she will be a female slave whom his right hand possesses.' When he rode on, he set aside a plate for her behind him and extended a Hijab between her and the people."

أَخْبَرَنَا عَلِيُّ بْنُ حُجْرٍ، قَالَ حَدَّثَنَا إِسْمَاعِيلُ، قَالَ حَدَّثَنَا حُمَيْدٌ، عَنْ أَنَسٍ، قَالَ أَقَامَ النَّبِيُّ صلى الله عليه وسلم بَيْنَ خَيْبَرَ وَالْمَدِينَةِ ثَلاَثًا يَبْنِي بِصَفِيَّةَ بِنْتِ حُيَىٍّ فَدَعَوْتُ الْمُسْلِمِينَ إِلَى وَلِيمَتِهِ فَمَا كَانَ فِيهَا مِنْ خُبْزٍ وَلاَ لَحْمٍ أَمَرَ بِالأَنْطَاعِ وَأَلْقَى عَلَيْهَا مِنَ التَّمْرِ وَالأَقِطِ وَالسَّمْنِ فَكَانَتْ وَلِيِمَتَهُ فَقَالَ الْمُسْلِمُونَ إِحْدَى أُمَّهَاتِ الْمُؤْمِنِينَ أَوْ مِمَّا مَلَكَتْ يَمِينُهُ فَقَالُوا إِنْ حَجَبَهَا فَهِيَ مِنْ أُمَّهَاتِ الْمُؤْمِنِينَ وَإِنْ لَمْ يَحْجُبْهَا فَهِيَ مِمَّا مَلَكَتْ يَمِينُهُ فَلَمَّا ارْتَحَلَ وَطَّأَ لَهَا خَلْفَهُ وَمَدَّ الْحِجَابَ بَيْنَهَا وَبَيْنَ النَّاسِ ‏.‏