Imam Malik's Muwatta, Chapter: Suckling

Yahya related to me from Malik that Abdullah ibn Dinar said, "A man came to Abdullah ibn Umar when I waswith him at the place where judgments were given and asked him about the suckling of an older person. Abdullah ibn Umar replied, 'A man came to Umar ibn al-Khattab and said, 'I have a slave-girl and I used to have intercourse with her. My wife went to her and suckled her. When I went to the girl, my wife told me to watch out, because she had suckled her!' Umar told him to beat his wife and to go to his slave-girl because kinship by suckling was only by the suckling of the young.' "