اَللَّهُ رَبِّي لَا أُشْرِكُ بِهِ شَيْئًا

Allahu Rabbee laa 'ushriku bihi shay'an

Allah is my Lord. I do not associate anything with Him. Ayesha (RA) said, "The Messenger of Allah (ﷺ), used to gather all his family together and say: If any of you are ever in trouble or in danger, say this."

Reference: Sahih. Ibn Majah: 3882