It was narrated from Zainab bint Abi Salamah that the wives of the Prophet ﷺ all differed with ‘ Aisha (RA) and refused to allow anyone with ties of breastfeeding like Sâlim, the freed slave of Abu Hudhaifah, to enter upon them. They said: “How do we know? That may be a concession granted only to Sâiim.” (Sahih)