O Allah, shade me under Your shade on the Day when there is no shade except Your — The Hereafter
اللَّهُمَّ أَظِلَّنِي فِي ظِلِّكَ يَوْمَ لَا ظِلَّ إِلَّا ظِلُّكَ
Transliteration: Allaahumma adhillanee fee dhillika yawma laa dhilla illaa dhilluk
Translation: O Allah, shade me under Your shade on the Day when there is no shade except Yours.
Reference: General supplication