And (remember) when the Prophet pbuh disclosed a matter in confidence to one of his wives (Ḥafsa) (up to) ... The All-Aware. (V.66:3)

Hadith Number 4914

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Narrated Ibn `Abbas

I intended to ask `Umar so I said, "Who were those two ladies who tried to back each other against the Prophet?" I hardly finished my speech when he said, They were `Aisha and Hafsa."