'Alert' in the Bible

Be on the alert and strengthen the remaining [things] that are about to die, for I have not found your works completed before my God.

Therefore remember how you have received and heard, and observe [it], and repent. If therefore you are not on the alert, I will come like a thief, and you will never know [at] what hour I will come against you.

(Behold, I am coming like a thief. Blessed [is] the one who is on the alert and who keeps his clothing, so that he does not walk around naked and they see his shamefulness!)