رَبِّ احْكُمْ بِالْحَقِّ، وَرَبُّنَا الرَّحْمَنُ الْمُسْتَعَانُ عَلَى مَا تَصِفُونَ
Transliteration
Rabbihkum bil-haqqi, wa Rabbunar-Rahmanul-musta'anu 'ala ma tasifun
English meaning
My Lord, judge in truth. And our Lord is the Most Merciful, the One whose help is sought against what you describe.
When is it recited?
Seeking justice.
Source
Al-Anbiya 21/112