Abu Dawud Book 2, Hadith Number 1210.

Chapter : On the combination of two prayers at a time.

Narated By Ibn ‘Abbas : The Apostle of Allah (PBUH) led us in prayer at Medina eight and seven rak’ahs, in the noon and the afternoon prayers, and the sunset and the night prayers. The narrators Sulaiman and Musaddad did not say the words “led us.”

Abu Dawud said: The aforesaid tradition has also been narrated by Salih client of Ru’mah on the authority of Ibn ‘Abbas, saying: “Not during rain.”