Ibn Abbas said: 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.
Hadith Referenceسنن ابي داود / أبواب تفريع استفتاح الصلاة / 772
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم (769)
Hadith Takhrij« انظر ما قبلہ، (تحفة الأشراف: 5702، 5744) (صحیح) »