It is narrated from Zayd bin Aslam (may Allah have mercy on him) that a man and his wife came to Umar bin al-Khattab (may Allah be pleased with him), and a woman came and said: I have nursed both of you. Umar bin al-Khattab (may Allah be pleased with him) refused to accept her statement and said: Your wife is yours (keep her).
This is mursal, and it has been narrated through another chain.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الرضاع / 15675