The Messenger of Allah (ﷺ) used to say in his tahajjud prayer(i.e. supererogatory prayer offered in or after the midnight) after he said the takbir; he then narrated the tradition to the same effect.
Reference: Sunan Abi Dawud 772 In-book : Book 2, Hadith 382 English translation : Book 2, Hadith 771
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