Sunan Abi Dawud Book 4, Hadith 16
'Abd Allah b. al-'Ala' narrated on the authority of Nafi' saying: When the twilight was about to disappear, he alighted and combined both (the prayers).
The mu'adhdhin of Ibn Umar said: prayer (i.e. the time of prayer has come). He said: Go ahead. He then alighted before the disappearance. He then offered the night prayer. He then said: When the Messenger of Allah (ﷺ) was in a hurry about something, he would do as I did. Then he travelled and covered a distance of three days' journey on the day.
Abu Dawud said: A similar tradition has been transmitted by Ibn Jabir from Nafi' with the same chain.
The Messenger of Allah (ﷺ) led us in prayer at Medina eight of seven rak'ahs, in the noon and afternoon prayers, and the sunset and night prayers. The narrator Sulaiman and Musaddad did not say the words "led us".
Abu Dawud said: The aforesaid tradition has also been narrated by Salih, the client of Tu'mah on the authority if Ibn 'Abbas saying: "Not during rain."