The Messenger of Allah (ﷺ) taught me to say when the adhan for the sunset prayer was called; "O Allah, this is the time when Your night comes on, Your day retires, and the voices of Your summoners are heard, so forgive me."
Reference: Sunan Abi Dawud 530 In-book : Book 2, Hadith 140 English translation : Book 2, Hadith 530
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