Sahih al-Bukhari 4103
Narrated `Aisha:
As regards the following Qur'anic Verse:-- "When they came on you from above and from below you 
(from east and west of the valley) and when the eyes grew wild and the hearts reached up to the 
throats....." (33.10) That happened on the day of Al-Khandaq (i.e. Trench).
حَدَّثَنِي عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عَبْدَةُ، عَنْ هِشَامٍ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، رضى الله عنها ‏{‏إِذْ جَاءُوكُمْ مِنْ فَوْقِكُمْ وَمِنْ أَسْفَلَ مِنْكُمْ وَإِذْ زَاغَتِ الأَبْصَارُ‏}‏ قَالَتْ كَانَ ذَاكَ يَوْمَ الْخَنْدَقِ‏.‏