Bulugh al-Maram #465
The Book of Prayer
Abu Dawud and at-Tirmidhi report something similar from 'Aishah (RA) that Allah's Messenger (ﷺ) used to recite a Surat in every Rak'at and in the last (third) Rak'at he would recite Qul Huwa Allahu Ahad (Surat al-Ikhlas) and al-Mu'awwidhatain.
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About Bulugh al-Maram
This hadith is #465 from Bulugh al-Maram, in the Book of The Book of Prayer. Bulugh al-Maram contains 1,767 hadiths across 16 books.