'Sentinel' in the Bible

"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.