Abu Dawud Book 2, Hadith Number 1247.
Chapter : The detailed injunctions about the supererogatory prayer and the rakahs of the sunan prayer.
Narated By ‘Abd Allah b. ‘Umar : The Apostle of Allah (PBUH) would pray two rak’ahs before and two after the noon prayer, two after the sunset prayer in his house, and two after the night prayer. He would not pray after the Friday prayer till he departed. He would then pray two rak’ahs.