Bulugh al-Maram #321
The Book of Prayer
And Abu Dawud has "Then read the Ummul-Qur'an (i.e. Surah al-Fatiha) and what ever Allah wishes".
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About Bulugh al-Maram
This hadith is #321 from Bulugh al-Maram, in the Book of The Book of Prayer. Bulugh al-Maram contains 1,767 hadiths across 16 books.