(7) باب فِي وَقْتِ الْعِشَاءِ الآخِرَةِ
Narrated An-Nu'man ibn Bashir:
I am the one who is best informed of the time of this prayer, i.e. the night prayer. The Messenger of Allah (ﷺ) used to offer it at the hour when the moon went down on its third night.
Reference: Sunan Abi Dawud 419
In-book reference: Book 2, Hadith 29
English translation: Book 2, Hadith 419