Abu Dawud Book 2, Hadith Number 1287.
Chapter : Prayer in the forenoon.
Narated By ‘Abd Allah b. Shaqiq : I asked ‘Aisha: Did the Apostle of Allah (PBUH) pray in the forenoon? She replied: No, except when he returned from a journey. I then asked: Did the Apostle of Allah (PBUH) recite the suras combining each other? She said: He would do so in the mufassal suras.