'Alert' in the Bible

“Be on guard and stay constantly alert [and pray]; for you do not know when the appointed time will come.

It is like a man away on a journey, who when he left home put his servants in charge, each with his particular task, and also ordered the doorkeeper to be continually alert.

Therefore, be continually on the alert—for you do not know when the master of the house is coming, whether in the evening, or at midnight, or when the rooster crows, or in the morning—

What I say to you I say to everyone, ‘Be on the alert [stay awake and be continually cautious]!’”