(5) باب فِي الْمَصَّةِ وَالْمَصَّتَيْنِ
In the narration transmitted on the authority of Ibn Bishr there is a mention of two sucklings and Ibn Abu Shaiba has narrated it with a small variation of wording.
Reference: Sahih Muslim 1451 d
In-book reference: Book 17, Hadith 27
USC-MSA web (English) reference(deprecated numbering scheme): Book 8, Hadith 3418