'Watch' in the Bible

The next day Saul separated the people into three companies. They came into the camp during the morning watch, and struck down the Ammonites until the heat of the day. Those who survived were scattered so that no two of them remained together.

Saul sent messengers to David's house to watch him so they could kill him in the morning. David's wife, Michal, told him, "If you don't escape with your life tonight, tomorrow you'll be put to death."