From Sahih Bukhari (Hadith 1860):
Narrated Ibrahim's grand-father that 'Umar(ra) in his last Hajj allowed the wives of the Prophet(ﷺ)to perform Hajj and he sent with them 'Uthman bin 'Affan(ra) and 'Abdur-Rahman bin 'Auf(ra) as escorts
Reference: Bukhari 1860