Sahih al-Bukhari · Hadith 1082

Shortening the Prayers (At-Taqseer)

Narrated `Abdullah bin `Umar: I offered the prayer with the Prophet, Abu Bakr and `Umar at Mina and it was of two rak`at. `Uthman in the early days of his caliphate did the same, but later on he started praying the full prayer