Bible Verses About Towers: Watchmen posted on, in times of danger

The lookout standing on the watchtower in Yizre'el saw Yehu's troops approaching and said, "I see some troops coming." Yoram said, "Have a horseman go to meet him and ask, "Are you coming in peace?"

I will stand at my watchpost; I will station myself on the rampart. I will look to see what [God] will say through me and what I will answer when I am reproved.