Isaiah 21:6

21:6 For thus hath the Lord said unto me, Go, set a watchman, let him declare what he seeth.

Isaiah 21:8

21:8 And he cried, A lion: My lord, I stand continually upon the watchtower in the daytime, and I am set in my ward whole nights:

Isaiah 21:11-12

21:11 The burden of Dumah. He calleth to me out of Seir, Watchman, what of the night? Watchman, what of the night? 21:12 The watchman said, The morning cometh, and also the night: if ye will enquire, enquire ye: return, come.