Талмуд к Дварим 4:43

Rebbi Simon ben Laqish went to Bostra; they came to him and said to him: Select for us a man as preacher, judge, scribe, reader; one who will do everything we need⁷⁷Full job description of a paid practicing rabbi.. He selected a Babylonian and said to him, I have a good place for you. He went to Rebbi Joḥanan who said to him, from Babylonia to Babylonia⁷⁸You came from Babylonia to be in the Holy Land; do not leave the Land. This ruling contradicts the one given to R. Assi.. Rebbi Jacob bar Abba said, since Rebbi Joḥanan said from Babylonia to Babylonia, that means one who buys there is not obligated. But is it not forbidden to go to Tyre⁷⁹Since Tyre is North of Akhzib, it is not in the Holy Land. Nevertheless, the rules of the Sabbatical are kept there., and if one buys there is he not obligated? It was found stated: A sign for Ammon, Moab, and the Land of Egypt: There are two regions⁸⁰Each country contains two regions. It is stated in Mishnah Yadayim4:3 that a “new decree”, enacted after the destruction of the Temple, requires Jewish farmers in these regions to give tithes of the poor. It is stated here that these obligations apply only to those parts of these countries which border on the Holy Land.. From the first one eats and it may be worked⁸¹One eats under the rules of the holiness of the Sabbatical; one works (or may not work) the land in the Sabbatical., from the other one eats and it may not be worked. Rebbi Joḥanan wanted to refer to (Deut. 4:43): “Beṣer in the prairie⁸²One of the cities of refuge, in the territory of Reuben. If Bostra is Beṣer then it belonged to the Biblical land of Israel and to the land held by the returnees from Babylonia, and must be obligated for all duties upon the Land. This was R. Joḥanan’s opinion when he told R. Assi (a Cohen) to go there to meet his mother. But then he asked R. Simeon ben Laqish, changed his mind and placed Bostra just outside the borders of the Land. In the Babli (Avodah Zarah 58b), the identification is R. Simeon’s and R. Joḥanan insists that these are different places. (Bostra is in the North, at the Eastern end of the Bashan highlands; Beṣer is in the South, in the low plain near the Dead Sea.)”. He asked Rebbi Simeon ben Laqish: Is Beṣer Bostra?