Chapter 18: Shortening the Prayers (At-Taqseer)
Narrated 'Aisha: "When the prayers were first enjoined they were of two rak 'at each. Later the prayer in a journey was
kept as it was but the prayers for non-travelers were completed." Az-Zuhri said, "I asked 'Urwa what
made Aisha pray the full prayers (in journey)." He replied, "She did the same as 'Uthman did."
Sahih al-Bukhari 1090