Reference for Gittin 75:6

תנן רשב"ג אומר בין כך ובין כך ישתעבד ואמר רבה בר בר חנה אמר יוחנן כל מקום ששנה רשב"ג במשנתנו הלכה כמותו חוץ מערב וצידן וראיה אחרונה

— R. Papa said: The territory of Ammon and Moab became purified [for acquisition by the Israelites] through [the occupation of] Sihon.<span class="x" onmousemove="('comment',' Israel were forbidden to occupy the territory of Ammon and Moab (Deut. II, 9, 19). Sihon had taken some of the land of Moab (Num. XXI, 26), and this the Israelites were permitted to conquer from him and occupy. (Cf. Jud. XI, 15 ff.). This shows that a heathen can acquire ownership by act of possession. ');">⁶</span>

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