Invocation
Upon encountering an enemy or those of authority
اللّهُـمَّ أَنْتَ عَضُـدي، وَأَنْتَ نَصـيري، بِكَ أَجـولُ وَبِكَ أَصـولُ وَبِكَ أُقـاتِل
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.
Abu Dawud 3/42, At-Tirmidhi 5/572. See also Al-Albani, Sahih At-Tirmidhi
3/183.