Sunan Abi Dawud, Hadith 4966 ⓘ
Ibn ‘Umar reported the prophet (May peace be upon him) as saying: The desert Arabs may not dominate you in respect of the name of your prayer. Beware! It is al-`Isha, but they milk their camels when it is fairly dark.
حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا سُفْيَانُ، عَنِ ابْنِ أَبِي لَبِيدٍ، عَنْ أَبِي سَلَمَةَ، قَالَ سَمِعْتُ ابْنَ عُمَرَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " لاَ تَغْلِبَنَّكُمُ الأَعْرَابُ عَلَى اسْمِ صَلاَتِكُمْ أَلاَ وَإِنَّهَا الْعِشَاءُ وَلَكِنَّهُمْ يُعْتِمُونَ بِالإِبِلِ " .
also referenced under: Hadith 4984 (DarusSalam) & Book 41, Hadith 4965 (USC-MSA)