Narrated `Aisha:
Originally, two rak`at were prescribed in every prayer. When the Prophet (ﷺ) migrated (to Medina) four rak`at were enjoined, while the journey prayer remained unchanged(i.e. two rak`at).
Reference | : Sahih al-Bukhari 3935 |
In-book reference | : Book 63, Hadith 160 |
USC-MSA web (English) reference | : Vol. 5, Book 58, Hadith 272 |
(deprecated numbering scheme) |