عَنْ أَسْمَاءَ بِنْتِ عُمَيْسٍ رَضِيَ اللَّهُ عَنْهَا قَالَتْ عَلَّمَنِي رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ كَلِمَاتٍ أَقُولُهَا عِنْدَ الْكَرْبِ اللَّهُ رَبِّي لَا أُشْرِكُ بِهِ شَيْئًا
It is narrated from Sayyida Asma bint Umais (may Allah be pleased with her), she says: The Messenger of Allah (peace and blessings be upon him and his family) taught me this supplication to recite at times of distress and grief: Allahu Rabbi la ushriku bihi shay'an (Allah is my Lord, I do not associate anything with Him).