Komentaryo sa Genesis 49:21: Rashi, Chizkuni, Da'at Zekenim & Ramban

אילה שלחה is symbolical of the valley of Gennesareth which ripens its fruits very quickly, just as a hind runs rapidly (Genesis Rabbah 99:12). אילה שלחה means A HIND LET LOOSE that it may run where it pleases.

נפתלי אילה שלוחה, “Naftaly is like a free running doe,” Members of that tribe being fast long distance runners, used to be dispatched to inform the civilian population of whether a battle had been won [or lost, so that they would be prepared for what would follow. Ed.] This is the meaning of the words following: הנותן אמרי שפר, “bearer of good news.” Compare Judges 5,18 ונפתלי על מאומי שדה, “Naftaly running swiftly across the open heights.”There is an opinion according to which the word: אילה does not refer to a doe, but means: “the plain,” as in Genesis 14 6; yet another opinion relates the word to אילן as in אילי הצדק in Isaiah 61,3: “oaks of righteousness.”

נפתלי אילה שלוחה, “Naftali (its territory) is (like) a free running doe;” its territory produces fruit that ripens easily and quickly, as if it had been chased and tries to escape the net it has fallen into.(B‘reshit Rabbah 99,12)