Isaiah 21:6-8 NIV

[6] This is what the Lord says to me: “Go, post a lookout and have him report what he sees. [7] When he sees chariots with teams of horses, riders on donkeys or riders on camels, let him be alert, fully alert.” [8] And the lookout shouted, “Day after day, my lord, I stand on the watchtower; every night I stay at my post.