Muwatta Malik #1339
Suckling
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّهُ قَالَ سَمِعْتُ سَعِيدَ بْنَ الْمُسَيَّبِ، يَقُولُ لاَ رَضَاعَةَ إِلاَّ مَا كَانَ فِي الْمَهْدِ وَإِلاَّ مَا أَنْبَتَ اللَّحْمَ وَالدَّمَ .
Yahya related to me from Malik that Yahya ibn Said said that he
heard Said ibn al-Musayyab say, "Suckling is only while the child is
in the cradle. If not, it does not cause flesh and blood relations."
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About Muwatta Malik
This hadith is #1339 from Muwatta Malik, in the Book of Suckling.