رَبَّنَآ أَفْرِغْ عَلَيْنَا صَبْرًا وَثَـبِّتْ أَقْدَامَنَا وَٱنصُرْنَا عَلَى ٱلْقَوْمِ ٱلْكَـٰفِرِينَ
Translation 
And when they (the children of Israel -prophet Jacob- (peace be upon him)) advanced to meet Jâlût (Goliath) and his forces, they invoked:"Our Lord! Pour forth on us patience, and set firm our feet and make us victorious over the disbelieving people."
Transliteration
rabbanaaa afrigh ‛alaynaa ṣabran wa thabbit aqdaamanaa wan-ṣurnaa ‛alal-qawmil-kaafireen
Sources:
Surah Al-Baqarah (2:250)
