'Sentinel' in the Bible
Now David [was] sitting between the two gates, and the sentinel went up to the roof of the gate by the wall and he lifted up his eyes and watched, and look, a man [was] running by himself.
Then the sentinel saw another man running, so the sentinel called to the gatekeeper and said, "Look, a man running alone." The king said, "This one also [is] bringing good news."
The sentinel said, "I [am] seeing [that] the running of the first [is] like the running of Ahimaaz the son of Zakok." The king said, "He [is] a good man; he will come, for good news."
So the sentinel reported, saying, "He went up to them, but he did not return, and the driving [is] like the driving of Jehu the son of Nimshi, for he drives with madness."
"Son of Man, speak to your nation's children and tell them: "If I bring war to a land, and the people of that land appoint one of their conscripted men to serve as a sentinel,
If that sentinel notices that violence is approaching, but does not sound an alarm, then because the nation does not take warning and the sword arrives and destroys their lives because of their guilt, I'll seek retribution for their shed blood from the one who was acting as sentinel.'"
"Now as for you, Son of Man, I've established you as a sentinel for the house of Israel. So whenever you hear a message from me, you are to warn the people from me.
While I was watching in my mind's visions on my bed, a holy sentinel came down from heaven.
As for the king seeing a holy sentinel coming down from heaven and saying, 'Chop down the tree and destroy it, but leave its taproot in the ground, with a band of iron and bronze around it, surrounded by the grass of the field. Let it become damp with the dew of the sky, and let it live with the wild animals, until seven periods of time go by for him' --