Abu al-Zubayr narrated to us: Ata' sent me and another man with me to Abdullah bin Umar (may Allah be pleased with them both). We asked him about a woman who suckles a boy in the cradle, or a girl, once. He said: She is unlawful for him. I said: Abdullah bin al-Zubayr (may Allah be pleased with them both) and Aishah (may Allah be pleased with her) hold that two sucklings or three sucklings do not make her unlawful to him. Abdullah bin Umar (may Allah be pleased with them both) said: The Book of Allah is more truthful than the statement of the two of them, and he recited the verse of suckling [Surah al-Nisa: 23].
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الرضاع / 15644