The fountain of Jacob shall be upon a land of corn and wine - The King James Version does not preserve the symmetry of the clauses. Render it: “Israel shall dwell in safety; alone shall the fountain of Jacob be” (compare Psalms 68:26; Isaiah 48:1); “in a land,” etc.
Related Commentaries of Deuteronomy 33:28
Deuteronomy 33:28
28 Israel then shall dwell in safety alone: the fountain of Jacob shall be upon a land of corn and wine; also his heavens shall drop down dew.