1)
What is the definition of "Masig G'vul Re'ehu"?
1.
Rashi, Targum Onkelos and Targum Yonasan: Refer to 19:14:1:1.
2.
Teshuvas Maharshal, 89: It is the Isur to impinge on another person's income. 1 .
1
Teshuvas Maharshal, 89: We learn it from here and not from "Lo Sasig G'vul Re'acha" in Parshas Shoftim, 19:14. See answer #1. It seems that it is only mi'de'Rabanan