Jamieson, Fausset & Brown

I--Isaiah speaking in the person of the Messiah. watchmen upon . . . walls--image from the watches set upon a city's wall to look out for the approach of a messenger with good tidings (Isa 52:7-8); the good tidings of the return of the Jewish exiles from Babylon, prefiguring the return from the present dispersion (compare Isa 21:6-11; Isa 56:10; Eze 3:17; Eze 33:7). The watches in the East are announced by a loud cry to mark the vigilance of the watchmen. ye that . . . mention . . . Lord--Hebrew, "ye that are the Lord's remembrancers"; God's servants who by their prayers "put God in remembrance" of His promises (Isa 43:26); we are required to remind God, as if God could, which He cannot, forget His promises (Psa 119:49; Jer 14:21).