Jamieson, Fausset and Brown on Zechariah 8:7

7. save my people from ... east ... west--that is, from every region (compare Psa 50:1; the "West" is literally, "the going down of the sun") to which they are scattered; they are now found especially in countries west of Jerusalem. The dispersion under Nebuchadnezzar was only to the east, namely, to Babylonia. The restoration, including a spiritual return to God (Zec 8:8), here foretold, must therefore be still future (Is 11:11, 12; 43:5, 6; Eze 37:21; Am 9:14, 15; also Zec 13:9; Jr 30:22; 31:1, 33).