Sahih Bukhari Volume 5, Book 64, Hadith 4105

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

Narrated By '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).