وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي بَكْرِ بْنِ حَزْمٍ، عَنْ عَمْرَةَ بِنْتِ عَبْدِ الرَّحْمَنِ، عَنْ عَائِشَةَ، زَوْجِ النَّبِيِّ صلى الله عليه وسلم أَنَّهَا قَالَتْ كَانَ فِيمَا أُنْزِلَ مِنَ الْقُرْآنِ عَشْرُ رَضَعَاتٍ مَعْلُومَاتٍ يُحَرِّمْنَ ثُمَّ نُسِخْنَ بِخَمْسٍ مَعْلُومَاتٍ فَتُوُفِّيَ رَسُولُ اللَّهِ صلى الله عليه وسلم وَهُوَ فِيمَا يُقْرَأُ مِنَ الْقُرْآنِ ‏.‏

Yahya related to me from Malik from Abdullah ibn Abi Bakr ibnHazm from Amra bint Abd ar-Rahman that A'isha, the wife of theProphet, may Allah bless him and grant him peace, said, "Amongst whatwas sent down of the Qur'an was 'ten known sucklings make haram' -then it was abrogated by 'five known sucklings'. When the Messenger ofAllah, may Allah bless him and grant him peace, died, it was what isnow recited of the Qur'an." Yahya said that Malik said, "Onedoes not act on this." Translation Not Available

Book Ref: Muwatta Imam Malik Book 30 Hadith 1292
Web Ref:  Muwatta Imam Malik Book 30 Hadith 17