Sunan an-Nasa'i 3310
سنن النسائي#3310SahihIt was narrated that 'Aishah said:"The Messenger of Allah said: 'Suckling once or twice does not make (marriage) prohibited
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih Muslim
In-book reference: 26:115