Muwatta Malik, Book 30, Hadith 15 (USC-MSA)

Yahya related to me from Malik from Abdullah ibn Dinar from Sulayman ibn Yasar and from Urwa ibn az-Zubayr from A'isha umm al- muminin, that the Messenger of Allah, may Allah bless him and grant him peace, said, " What is haram by birth is haram by suckling."

وَحَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنْ سُلَيْمَانَ بْنِ يَسَارٍ، عَنْ عُرْوَةَ بْنِ الزُّبَيْرِ، عَنْ عَائِشَةَ أُمِّ الْمُؤْمِنِينَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ يَحْرُمُ مِنَ الرَّضَاعَةِ مَا يَحْرُمُ مِنَ الْوِلاَدَةِ ‏" ‏ ‏.‏

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also referenced under: Book 30, Hadith 1290 (In-Book)