Musannaf Ibn Abi Shayba 9:1119

'Abdah narrated to us, from Ibn Abi 'Arubah, from Qatadah, from Abu al-Khalil, from 'Abdullah ibn al-Harith, from Umm al-Fadl, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "One suckling or two sucklings, and one pull or two pulls, do not make [marriage] unlawful."