The Prophet said: "Do not let the Bedouins make you change the name of your prayer." Ibn Harmalah added: "Rather it is the 'Isha', but they say the 'Atamah because they bring their camels in for milking at that time (when it is dark)."
Reference: Sunan Ibn Majah 705 In-book : Book 2, Hadith 39 English translation : Vol. 1, Book 2, Hadith 705
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