Abu Dawud 4/333. Al-Albani graded it good in Sahih Abu Dawud 3/965.
Hisnul Muslim 200
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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 89th chapter, "To one who pronounces his love for you, for Allah’s sake" there is 1 supplication that you can learn and recite.
Tips for learning:
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.