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Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
malik:38-7 – Mālik > Nāfiʿ > ʿAbdullāh b. ʿUmar > ʿUmar b. al-Khaṭṭāb

Malik related to me from Nafi from Abdullah ibn Umar that Umar ibn al-Khattab said, "If a slave-girl gives birth to a child by her master, he must not sell her, give her away, or bequeath her. He enjoys her and when he dies she is free ."  

مالك:٣٨-٧ – حَدَّثَنِي مَالِكٌ عَنْ نَافِعٍ عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ أَنَّ عُمَرَ بْنَ الْخَطَّابِ

قَالَ أَيُّمَا وَلِيدَةٍ وَلَدَتْ مِنْ سَيِّدِهَا فَإِنَّهُ لاَ يَبِيعُهَا وَلاَ يَهَبُهَا وَلاَ يُوَرِّثُهَا وَهُوَ يَسْتَمْتِعُ بِهَا فَإِذَا مَاتَ فَهِيَ حُرَّةٌ  

See similar narrations below:

Collected by Bayhaqī
bayhaqi:21763 – Abū Bakr Aḥmad b. al-Ḥasan And ʾAbū Zakariyyā Yaḥyá b. Ibrāhīm b. Muḥammad b. Yaḥyá > Abū al-ʿAbbās Muḥammad b. Yaʿqūb > Muḥammad b. ʿAbdullāh b. ʿAbd al-Ḥakam > Ibn Wahb > ʿUmar b. Muḥammad Waʿubayd Allāh b. ʿUmar Wamālik b. Anas Waghayruhum > Nāfiʿ > ʿAbdullāh b. ʿUmar > ʿUmar b. al-Khaṭṭāb

[Machine] Whichever female offspring is born from her master, he does not sell her, nor does he grant her as a gift, nor does he inherit her. And he enjoys her until he dies, then she becomes free.  

البيهقي:٢١٧٦٣ – أَخْبَرَنَا أَبُو بَكْرٍ أَحْمَدُ بْنُ الْحَسَنِ وَأَبُو زَكَرِيَّا يَحْيَى بْنُ إِبْرَاهِيمَ بْنِ مُحَمَّدِ بْنِ يَحْيَى قَالَا ثنا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ أنبأ مُحَمَّدُ بْنُ عَبْدِ اللهِ بْنِ عَبْدِ الْحَكَمِ أنبأ ابْنُ وَهْبٍ أَخْبَرَنِي عُمَرُ بْنُ مُحَمَّدٍ وَعُبَيْدُ اللهِ بْنُ عُمَرَ وَمَالِكُ بْنُ أَنَسٍ وَغَيْرُهُمْ أَنَّ نَافِعًا أَخْبَرَهُمْ عَنْ عَبْدِ اللهِ بْنِ عُمَرَ أَنَّ عُمَرَ بْنَ الْخَطَّابِ ؓ قَالَ

أَيُّمَا وَلِيدَةٍ وَلَدَتْ مِنْ سَيِّدِهَا فَإِنَّهُ لَا يَبِيعُهَا وَلَا يَهَبُهَا وَلَا يُوَرِّثُهَا وَهُوَ يَسْتَمْتِعُ مِنْهَا فَإِذَا مَاتَ فَهِيَ حُرَّةٌ