سُبْحَانَكَ اللَّهُمَّ وَبِحَمْدِكَ، وَتَبَارَكَ اسْمُكَ، وَتَعَالَى جَدُّكَ، وَلَا إِلَهَ غَيْرُكَ
Transliteration
Subhanakallahumma wa bihamdika, wa tabarakasmuka, wa ta'ala jadduka, wa la ilaha ghayruk
English meaning
How perfect You are O Allah, and I praise You. Blessed is Your name, exalted is Your majesty, and there is no god worthy of worship except You.
When is it recited?
Recited after the opening takbir, before Al-Fatiha.
Source
Abu Dawud, Salat 121, 776; Tirmidhi, Salat 179, 243