(39) باب وَقْتِ الْعِشَاءِ وَتَأْخِيرِهَا
Abdullah b. 'Umar reported:
I heard the Messenger of Allah (ﷺ) as saying: Let the bedouin not gain upper hand over you in regard to the name of your prayer. See I (The night prayer should be called) 'Isya' (and the bedouins call it Atama (because) they milk their camels late.
Reference: Sahih Muslim 644 a
In-book reference: Book 5, Hadith 291
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1343