مالك عن عبدالله بن دينار أنه قال جاء رجل إلى عبدالله بن عمر وأنا معه عند دار القضاء يسأله عن رضاعة الكبير فقال عبدالله بن عمر جاء رجل إلى عمر بن الخطاب فقال اني كانت لي وليدة وكنت أطؤها فعمدت امرأتي إليها فارضعتها فدخلتُ عليها فقالت دونك فقد والله أرضعتُها فقال عمر أوجعها واتِ جاريتك فانما الرضاعة رضاعة الصغر
موطأ الإمام مالك كتاب الرضاع
Malik related from Abdullah ibn Dinar, who said: I was with a man who came to Abdullah ibn ‘Umar at the house where judgments were administered, asking him about the suckling of adults. Abdullah ibn ‘Umar said: A certain man came to ‘Umar ibn Al-Khattab and said: I had a slave girl and I used to have sex with her, but my wife proceeded to go to her and suckle her. Then I went in to see the girl, but my wife said: Watch out! I swear by Allah I have suckled her. ‘Umar said: Beat her [the wife], and go ahead to your servant girl; for indeed the issue of suckling [i.e. kinship from suckling] only applies to suckling the young.
Muwatta Malik, The book of suckling