رَبَّنَآ أَفْرِغْ عَلَيْنَا صَبْرًا وَثَبّتْ أَقْدَامَنَا وَانصُرْنَا عَلَى الْقَوْمِ الْكَـفِرِينَ
"Our Lord! Pour forth on us patience, and set firm our feet and make us victorious over the disbelieving people.'' (Surah-Al-Baqara: 250)
This is the Duah that Prophet Dawud Alaihissalam and his followers invoked to Allah when they advanced to meet Jalut (Goliath) and his forces.