Mukhtasar Sahih Bukhari — Hadith 348

‘Sayyiduna Abdullah Muzani (may Allah be pleased with him) narrates that’ the Prophet Muhammad (peace and blessings be upon him) said: “Let not the Bedouins overpower you regarding the name of your Maghrib prayer (i.e., let them not give it another name).” And he said: “The Bedouins say that it (i.e., Maghrib) is ‘Isha.”