Volume 2, Book 20, Number 206:
Narrated Ibn ‘Umar:
I accompanied Allah’s Apostle and he never offered more than two Rakat during the journey. Abu
Bakr, ‘Umar and ‘Uthman used to do the same.
Volume 2 – 255 / 1700
SAHIH BUKHARI VOLUME 2 > BOOK 20: SHORTENING THE PRAYERS (AT-TAQSEER)