Umar bin Habib narrated to me from a man of Banu Atwarah, and sometimes Sufyan said: from a man of Banu Kinanah, (that he was asked): Are you from Banu so-and-so? I said: No, but they nursed me. He said: I heard Umar (may Allah be pleased with him) saying: "Milk passes on resemblance to him (the child)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الرضاع / 15679