Isaiah 21:6-8 New Revised Standard Version (NRSV)
6 For thus the Lord said to me:
“Go, post a lookout,
let him announce what he sees.
7 When he sees riders, horsemen in pairs,
riders on donkeys, riders on camels,
let him listen diligently,
8 Then the watcher called out:
“Upon a watchtower I stand, O Lord,
continually by day,
and at my post I am stationed
throughout the night.