Maliks Muwatta Book 30, Hadith Number 3.
Section : Suckling of the Young.
Yahya related to me from Malik from Ibn Shihab from Urwa ibn az-Zubayr that A’isha umm al-muminin told him that Aflah, the brother of Abu’l-Quays came and asked permission to visit her after the veil had been lowered, and he was her paternal uncle by suckling. She said, “I refused to give him permission to enter. When the Messenger of Allah, may Allah bless him and grant him peace, came, I told him about what I had done, and he ordered me to give him permission to enter.”