Jami` at-Tirmidhi, Book 48, Hadith 215 (In-Book) ⓘ
Anas narrated that when the Prophet would go out for an expedition, he would say: “O Allah, You are my `Aḍud and You are my Helper, and by You do I fight (Allāhumma anta `aḍudī, wa anta naṣīrī, wa bika uqātil).”
حَدَّثَنَا نَصْرُ بْنُ عَلِيٍّ الْجَهْضَمِيُّ، أَخْبَرَنِي أَبِي، عَنِ الْمُثَنَّى بْنِ سَعِيدٍ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم إِذَا غَزَا قَالَ " اللَّهُمَّ أَنْتَ عَضُدِي وَأَنْتَ نَصِيرِي وَبِكَ أُقَاتِلُ " . قَالَ هَذَا حَدِيثٌ حَسَنٌ غَرِيبٌ وَمَعْنَى قَوْلِهِ عَضُدِي . يَعْنِي عَوْنِي .
also referenced under: Hadith 3584 (Reference) & Volume 6, Book 46, Hadith 3584 (DarusSalam)