Muwatta Malik 1277
موطأ مالك#1277SahihYahya related to me from Malik from Nafi that Abdullah ibn Umar said, "There is no kinship by suckling except for a person who is nursed when he is small. There is no kinship by suckling over the age of two years
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliMauquf Sahih
In-book reference: 30:6