Midrash for Deuteronomy 3:9

Similarly, (Devarim 3:9) "The Tziddonim called Chermon Siryon, and the Emori called it S'nir," and, elsewhere, (Ibid. 4:48) "until Mount Sion, which is Chermon" — whence it is found to have four names. Now why do future generations need to know this? (To impress upon them) that four kings were contending over it, each one saying "Let it be called by my name!" Now does this not follow a fortiori, viz.: If four kings contended thus over the "refuse" of Eretz Yisrael, how much more so is Eretz Yisrael (itself) to be lauded!