Muawiyah ibn Haidah narrates that the Messenger of Allah (ص) said:
"The duel of Ali bin Abi Talib with Amr ibn Abd al-Wud on the day of Al-Khandaq (battle of the Trench) is superior than the deeds of my Ummah until the Day of Resurrection"
Dailami, Firduas Al-Akhbar, V.3, page 504; Hakim Nishapuri, Al-Mustadrak, V. 3, page 32; Kharazmi, Al-Manaqib, page 107; Khatib Baghdadi, Tarikh-e-Baghdad, V.13, page 19; Muttaqi Hindi, Kanz al-Ummal, V.11, page 623; Hakim al-Haskani, Shawahid al-Tanzil, V.2, page 14.