Arabic (Original)
قَالَ وَكَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا غَزَا قَالَ اللَّهُمَّ أَنْتَ عَضُدِي وَأَنْتَ نَصِيرِي وَبِكَ أُقَاتِلُ.
English Translation
He said: And the Prophet, peace and blessings be upon him, whenever he went out on a military campaign, would say, "O God, You are my strength and You are my helper, and by You I fight."