سنن أبي داود

Narrated Mu'adh ibn Jabal:

We waited for the Prophet (ﷺ) to offer the night prayer. He delayed until people thought that he would not come out and some of us said that he had offered the prayer. At the moment when we were in this condition the Prophet (ﷺ) came out. People said to him as they were already saying. He said: Observe this prayer when it is dark, for by it you have been made superior to all the peoples, no people having observed it before you.