Commentary for Avodah Zarah 41:6
והא שכירות שדה דבסוריא דגזרה לגזרה היא וקא גזרינן התם לאו גזרה הוא קסבר כיבוש יחיד שמיה כיבוש
But is not the letting of a field in Syria is a decree on another decree, and yet we still make that decree? That is not a decree, for it follows the opinion that even the annexation by an individual is to be regarded as annexed [to Israel].
Daf Shevui to Avodah Zarah
The Talmud raises a problem, that renting a field to a non-Jew is prohibited even in Syria, even though this is a decree made on a decree. The resolution is that this mishnah considers Syria to be part of Israel even though it was only conquered by an individual (David). Thus the rules concerning selling them land could apply in principle. When it comes to renting them a field, the rabbis ruled strictly because there are two problems (giving them a foothold and tithes), but renting a house, where there is only one problem (giving them a foothold), is permitted.
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