Narrated Ibn `Abbas:
Regarding the saying of Allah: 'And they will not disobey you in any just matter.' (60.12) That was one of the conditions which Allah imposed on The believing) women (who came to take the oath of allegiance to the Prophet).
USC-MSA web (English) reference: Vol. 6, Book 60, Hadith 416
Arabic reference: Book 65, Hadith 4893