اللَّهُمَّ بَيِّضْ وَجْهِي يَوْمَ تَبْيَضُّ وُجُوهٌ وَتَسْوَدُّ وُجُوهٌ
Allahumma bayyid wajhi yawma tabyadduwujuhun wa taswaddu wujuh
Ó Allah, ilumina meu rosto no Dia em que rostos serão iluminados e rostos serão escurecidos.
While washing the face during wudu
This dua asks Allah for salvation on the Day of Judgment.