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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:29-102 – Mālik > Nāfiʿ > ʿAbdullāh b. ʿUmar

Malik related to me from Nafi that Abdullah ibn Umar said, "The idda of an umm walad when her master dies is one menstrual period."  

مالك:٢٩-١٠٢ – وَحَدَّثَنِي عَنْ مَالِكٍ عَنْ نَافِعٍ عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ

أَنَّهُ قَالَ عِدَّةُ أُمِّ الْوَلَدِ إِذَا تُوُفِّيَ عَنْهَا سَيِّدُهَا حَيْضَةٌ  

See similar narrations below:

Collected by Bayhaqī
bayhaqi:15578 – Abū Aḥmad al-Mihrajānī > Abū Bakr b. Jaʿfar > Muḥammad b. Ibrāhīm > Yaḥyá b. Bukayr > Mālik > Yaḥyá b. Saʿīd > al-Qāsim b. Muḥammad > In Yazīd b. ʿAbd al-Malik Farraq Bayn Rijāl And Nisāʾihim Kun Ummahāt Awlād Rijāl Halakūā Fatazawwajūhun Baʿd Ḥayḍah Waḥayḍatayn Fafarraq Baynahum Ḥattá Yaʿtadidn Arbaʿah Ashhur Waʿashr > al-Qāsim b. Muḥammad Subḥān Allāh

[Machine] He used to say that when the mother of a child passes away, her master's obligation (to her) is the waiting period (Iddah). Malik said, may Allah have mercy on him, and that is the matter according to us.  

البيهقي:١٥٥٧٨ – وَأَخْبَرَنَا أَبُو أَحْمَدَ الْمِهْرَجَانِيُّ أنا أَبُو بَكْرِ بْنُ جَعْفَرٍ نا مُحَمَّدُ بْنُ إِبْرَاهِيمَ نا يَحْيَى بْنُ بُكَيْرٍ نا مَالِكٌ عَنْ يَحْيَى بْنِ سَعِيدٍ أَنَّهُ قَالَ سَمِعْتُ الْقَاسِمَ بْنَ مُحَمَّدٍ يَقُولُ إِنَّ يَزِيدَ بْنَ عَبْدِ الْمَلِكِ فَرَّقَ بَيْنَ رِجَالٍ وَنِسَائِهِمْ كُنَّ أُمَّهَاتِ أَوْلَادِ رِجَالٍ هَلَكُوا فَتَزَوَّجُوهُنَّ بَعْدَ حَيْضَةٍ وَحَيْضَتَيْنِ فَفَرَّقَ بَيْنَهُمْ حَتَّى يَعْتَدِدْنَ أَرْبَعَةَ أَشْهُرٍ وَعَشْرًا قَالَ الْقَاسِمُ بْنُ مُحَمَّدٍ سُبْحَانَ اللهِ يَقُولُ اللهُ تَبَارَكَ وَتَعَالَى فِي كِتَابِهِ {وَالَّذِينَ يُتَوَفَّوْنَ مِنْكُمْ وَيَذَرُونَ أَزْوَاجًا} [البقرة 234] مَا هُنَّ لَهُمْ بِأَزْوَاجٍ 15578 وَبِهِ عَنِ الْقَاسِمِ بْنِ مُحَمَّدٍ

أَنَّهُ كَانَ يَقُولُ عِدَّةُ أُمِّ الْوَلَدِ إِذَا تُوُفِّيَ عَنْهَا سَيِّدُهَا حَيْضَةٌ قَالَ مَالِكٌ رَحِمَهُ اللهُ وَذَلِكَ الْأَمْرُ عِنْدَنَا