"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) Sahih al-Bukhari 4914
Arabic hadith text
حَدَّثَنَا عَلِيٌّ، حَدَّثَنَا سُفْيَانُ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، قَالَ سَمِعْتُ عُبَيْدَ بْنَ حُنَيْنٍ، قَالَ سَمِعْتُ ابْنَ عَبَّاسٍ ـ رضى الله عنهما ـ يَقُولُ أَرَدْتُ أَنْ أَسْأَلَ عُمَرَ فَقُلْتُ يَا أَمِيرَ الْمُؤْمِنِينَمَنِ الْمَرْأَتَانِ اللَّتَانِ تَظَاهَرَتَا عَلَى رَسُولِ اللَّهِ صلى الله عليه وسلم فَمَا أَتْمَمْتُ كَلاَمِي حَتَّى قَالَ عَائِشَةُ وَحَفْصَةُ.
Translation
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."