The Messenger of Allah ﷺ said: Let the bedouin not gain upper band over you In regard to the name of your prayer, i. e. night prayer, for it is mentioned 'Isya' in the Book of Allah (i. e. the Qur'an). (The bedouin call it 'Atama because) they make delay in milling their she-camels.
قَالَ رَسُولُ اللَّهِ ﷺ لاَ تَغْلِبَنَّكُمُ الأَعْرَابُ عَلَى اسْمِ صَلاَتِكُمُ الْعِشَاءِ فَإِنَّهَا فِي كِتَابِ اللَّهِ الْعِشَاءُ وَإِنَّهَا تُعْتِمُ بِحِلاَبِ الإِبِلِ