Al-Hajjaj bin al-Hajjaj narrates from Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "One suck and two sucks do not establish the prohibition through suckling, and suckling does not establish the prohibition except that which fills the intestines." Uthman said: "It does not make unlawful except the milk that fills the intestines." Al-Zuhri and Hisham narrated it from Urwah as mawquf (a Companion's statement), with part of its meaning attributed to Abu Hurayrah (may Allah be pleased with him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الرضاع / 15635