At-Tirmidhi 5/493,4. See also Al-Albani, Sahih At-Tirmidhi 3/153.
Hisnul Muslim 194
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For those unfamiliar, Hisnul Muslim (Fortress of the Muslim) is a well-known du'a book compiled by Said Bin Ali Bin Wahf Al-Qahtani. It categorizes authentic supplications that the Prophet ﷺ made in various situations. In the 83rd chapter, "Upon seeing someone in trial or tribulation" there is 1 supplication that you can learn and recite.
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We've created a video for each du'a to try and make it easy to learn. There's also transliteration and translation for every du'a. Lastly, after pressing the play button you can tap on any word and it'll skip to that part in the audio.