Bulugh al-Maram #511
The Book of Prayer
Narrated 'Aishah (RA) that when the Salat (prayer) was first prescribed, it consisted of two Rak'at. Afterwards, the prayer during travelling was confirmed (as two Rak'at), while the prayer at the place of residence was completed (as four Rak'at).
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About Bulugh al-Maram
This hadith is #511 from Bulugh al-Maram, in the Book of The Book of Prayer. Bulugh al-Maram contains 1,767 hadiths across 16 books.