وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ صَفِيَّةَ بِنْتَ أَبِي عُبَيْدٍ، أَخْبَرَتْهُ أَنَّ حَفْصَةَ أُمَّ الْمُؤْمِنِينَ أَرْسَلَتْ بِعَاصِمِ بْنِ عَبْدِ اللَّهِ بْنِ سَعْدٍ إِلَى أُخْتِهَا فَاطِمَةَ بِنْتِ عُمَرَ بْنِ الْخَطَّابِ تُرْضِعُهُ عَشْرَ رَضَعَاتٍ لِيَدْخُلَ عَلَيْهَا وَهُوَ صَغِيرٌ يَرْضَعُ فَفَعَلَتْ فَكَانَ يَدْخُلُ عَلَيْهَا ‏.‏

Yahya related to me from Malik from Nafi that Safiyya bint AbiUbayd told him that Hafsa, umm al-muminin, sent Asim ibn Abdullah ibnSad to her sister Fatima bint Umar ibn al-Khattab for her to sucklehim ten times so that he could come in to see her. She did it, so heused to come in to see her. Translation Not Available

Book Ref: Muwatta Imam Malik Book 30 Hadith 1282
Web Ref:  Muwatta Imam Malik Book 30 Hadith 8