Abu Dawud Book 4, Hadith Number 1924.

Narated By Abdullah ibn Umar : Abdullah ibn Malik said: I offered three rak’ahs of the sunset prayer and two rak’ahs of the night prayer along with Ibn Umar. Thereupon Malik ibn al-Harith said: What is this prayer? He said: I offered these prayers along with the Apostle of Allah (PBUH) in this place with a single iqamah.