Jamieson, Fausset & Brown

watchmen--set on towers separated by intervals to give the earliest notice of the approach of any messenger with tidings (compare Isa 21:6-8). The Hebrew is more forcible than English Version, "The voice of thy watchmen" (exclamatory as in Sol 2:8). "They lift up their voice! together they sing." eye to eye--that is, close at hand, and so clearly [GESENIUS]; Num 14:14, "face to face"; Num 12:8, "mouth to mouth." Compare Co1 13:12; Rev 22:4, of which Simeon's sight of the Saviour was a prefiguration (Luk 2:30). The watchmen, spiritually, are ministers and others who pray for the peace of Jerusalem (Isa 62:6-7), bring again--that is, restore. Or else, "return to" [MAURER].