Narrated `Ali bin Abi Talib: We were in the company of the Prophet (ﷺ) on the day (of the battle) of Al-Khandaq (the Trench). The Prophet said, "May Allah fill their (the infidels') graves and houses with fire, as they have kept us so busy that we could not offer the middle prayer till the sun had set; and that prayer was the `Asr prayer."
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا الأَنْصَارِيُّ، حَدَّثَنَا هِشَامُ بْنُ حَسَّانَ، حَدَّثَنَا مُحَمَّدُ بْنُ سِيرِينَ، حَدَّثَنَا عَبِيدَةُ، حَدَّثَنَا عَلِيُّ بْنُ أَبِي طَالِبٍ ـ رضى الله عنه ـ قَالَ كُنَّا مَعَ النَّبِيِّ صلى الله عليه وسلم يَوْمَ الْخَنْدَقِ، فَقَالَ " مَلأَ اللَّهُ قُبُورَهُمْ وَبُيُوتَهُمْ نَارًا، كَمَا شَغَلُونَا عَنْ صَلاَةِ الْوُسْطَى حَتَّى غَابَتِ الشَّمْسُ ". وَهْىَ صَلاَةُ الْعَصْرِ.
sunnah.com