Abu 'Ubaidah al-Jarrah (RAA) narrated, 'I heard the Messenger of Allah (ﷺ) say, "Muslims must respect the protection granted (to a non-Muslim) by other Muslims." Related by Ibn Abi Shaibah and Ahmad with a weakness in its chain of narrators.
English reference: Book 11, Hadith 1337
Arabic reference: Book 11, Hadith 1310