عَنْ أَنَسٍ رَضِيَ اللَّهُ عَنْهُ قَالَ كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ إِذَا غَزَا قَالَ اللَّهُمَّ أَنْتَ عَضُدِي وَأَنْتَ نَصِيرِي وَبِكَ أُقَاتِلُ
It is narrated from Sayyiduna Anas (may Allah be pleased with him) that when the Noble Prophet (peace and blessings be upon him) would fight the enemy, he would supplicate: "O Allah! You are my support and You are my helper, and by You I fight." (O Allah! You alone are my arm and my helper, and I fight the enemy relying only on You.)