Sahih Bukhari Volume 4, Book 61, Hadith 3625

حَدَّثَنَا أَبُو نُعَيْمٍ، حَدَّثَنَا زَكَرِيَّاءُ، عَنْ فِرَاسٍ، عَنْ عَامِرٍ، عَنْ مَسْرُوقٍ، عَنْ عَائِشَةَ رضى الله عنها قَالَتْ أَقْبَلَتْ فَاطِمَةُ تَمْشِي، كَأَنَّ مِشْيَتَهَا مَشْىُ النَّبِيِّ صلى الله عليه وسلم فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ مَرْحَبًا بِابْنَتِي ‏"‏‏.‏ ثُمَّ أَجْلَسَهَا عَنْ يَمِينِهِ أَوْ عَنْ شِمَالِهِ، ثُمَّ أَسَرَّ إِلَيْهَا حَدِيثًا، فَبَكَتْ فَقُلْتُ لَهَا لِمَ تَبْكِينَ ثُمَّ أَسَرَّ إِلَيْهَا حَدِيثًا فَضَحِكَتْ فَقُلْتُ مَا رَأَيْتُ كَالْيَوْمِ فَرَحًا أَقْرَبَ مِنْ حُزْنٍ، فَسَأَلْتُهَا عَمَّا قَالَ‏ فَقَالَت: مَا كُنْتُ لأُفْشِىَ سِرُّ رَسُولِ اللهِ صلى الله عليه وسلم حَتَّى قُبِضَ النَّبِىُّ صلى الله عليه وسلم فَسَأَلتُهَا

Narrated By 'Aisha : Once Fatima came walking and her gait resembled the gait of the Prophet. The Prophet said, "Welcome, O my daughter!" Then he made her sit on his right or on his left side, and then he told her a secret and she started weeping. I asked her, "Why are you weeping?" He again told her a secret and she started laughing. I said, "I never saw happiness so near to sadness as I saw today." I asked her what the Prophet had told her. She said, "I would never disclose the secret of Allah's Apostle." When the Prophet died, I asked her about it.