(5) باب فِي الْمَصَّةِ وَالْمَصَّتَيْنِ
Umm Fadl (Allah be pleased with her) reported that Allah's Apostle (ﷺ) said:
Being suckled once or twice, or one suckling or two, do not make marriage unlawful.
Reference: Sahih Muslim 1451 c
In-book reference: Book 17, Hadith 26
USC-MSA web (English) reference(deprecated numbering scheme): Book 8, Hadith 3417