Sahih al-Bukhari 1235
Narrated Asma':
I went to `Aisha and she was standing praying and the people, too, were standing (praying). So I said, 
"What is the matter with the people?" She beckoned with her head towards the sky. 
I said, "(Is there) a sign?" She nodded intending to say, "Yes."
حَدَّثَنَا يَحْيَى بْنُ سُلَيْمَانَ، قَالَ حَدَّثَنِي ابْنُ وَهْبٍ، حَدَّثَنَا الثَّوْرِيُّ، عَنْ هِشَامٍ، عَنْ فَاطِمَةَ، عَنْ أَسْمَاءَ، قَالَتْ دَخَلْتُ عَلَى عَائِشَةَ ـ رضى الله عنها ـ وَهِيَ تُصَلِّي قَائِمَةً وَالنَّاسُ قِيَامٌ فَقُلْتُ مَا شَأْنُ النَّاسِ فَأَشَارَتْ بِرَأْسِهَا إِلَى السَّمَاءِ‏.‏ فَقُلْتُ آيَةٌ‏.‏ فَقَالَتْ بِرَأْسِهَا أَىْ نَعَمْ‏.‏