Silsilat al-Ahadith al-Sahihah

Sayyiduna Abu Sa‘id Khudri (may Allah be pleased with him) says: On the day of the Trench, we said: O Messenger of Allah! Is there any dhikr (remembrance) that we can say (to relieve our anxiety), our hearts have reached our mouths? The Prophet (peace and blessings of Allah be upon him) said: “Yes, say: O Allah! Conceal our faults and grant us security from our fears.” Then Allah, the Exalted, sent a (violent and fierce) wind upon the enemies and defeated them through the wind.

It is narrated from Sayyidah Aisha (may Allah be pleased with her) that the Noble Prophet (peace and blessings be upon him) would gather his family and say: "If anyone is afflicted with grief and distress, he should say: «اللَّهُ ، اللَّهُ رَبِّى؛ لاَ أُشْرِكُ بِهِ شَيْئاً » Allah, Allah is my Lord, I do not associate anyone with Him."