TT #331 · Parashas Shoftim · Seventh Aliyah · Passuk 21:01
If a slain person is found in the land that the Eternal your God is giving you to possess, lying in the field, and it is not known who struck him.
Torah Temimah points to Sotah 45a.
TT lemma: בָּאֲדָמָה אֲשֶׁר ה׳ אֱלֹהֶיךָ נֹתֵן לְךָ.
English: ‘In the land that the Eternal your God is giving you’ – in the Land of Israel.
Derash on territorial scope (Bavli) — the language ties the law to the inherited land.
The ceremony of the eglah arufah applies in the Land of Israel; it is not performed outside the Land.