The Messenger of Allah (ﷺ), used to say during the battle:
اَللَّهُمَّ أَنْتَ عَضُدِي، وَأَنْتَ نَصِيرِي، بِكَ أَحُولُ وَبِكَ أَصُولُ، وَبِكَ أُقَاتِلُ
Pronunciation
Allaahumma 'Anta 'adhudee, wa 'Anta naseeree, bika 'a'hoolu, wa bika 'asoolu, wa bika 'uqaatilu
Meaning
O Allah, You are my strength and You are my support. For Your sake I go forth and for Your sake I advance and for Your sake I fight.
Source: Hasan Gharib. Abu Dawud: 2632
Read the hadith
حَدَّثَنَا نَصْرُ بْنُ عَلِيٍّ، أَخْبَرَنَا أَبِي، حَدَّثَنَا الْمُثَنَّى بْنُ سَعِيدٍ، عَنْ قَتَادَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم إِذَا غَزَا قَالَ " اللَّهُمَّ أَنْتَ عَضُدِي وَنَصِيرِي بِكَ أَحُولُ وَبِكَ أَصُولُ وَبِكَ أُقَاتِلُ " .
Narrated Anas ibn Malik: When the Messenger of Allah (ﷺ) went on an expedition, he said: O Allah, Thou art my aider and helper; by Thee I move, by Thee I attack, and by Thee I fight. [Hasan Garib (Albani). Abu Dawud: 2632]
Duas from IslamicAPI's Masnun Dua dataset (based on the Quran, hadith, Hisnul Muslim and Rahe Belayat). See the dataset