The Prophet ﷺ said, "Do not be influenced by bedouins regarding the name of your Maghrib prayer which is called ʿIsha' by them."  

أَنَّ النَّبِيَّ ﷺ قَالَ لاَ تَغْلِبَنَّكُمُ الأَعْرَابُ عَلَى اسْمِ صَلاَتِكُمُ الْمَغْرِبِ قَالَ الأَعْرَابُ وَتَقُولُ هِيَ الْعِشَاءُ