'Watch' in the Bible

So make your minds ready, and keep on the watch, hoping with all your power for the grace which is to come to you at the revelation of Jesus Christ;

Because, like sheep, you had gone out of the way; but now you have come back to him who keeps watch over your souls.

But the end of all things is near: so be serious in your behaviour and keep on the watch with prayer;

Keep watch over the flock of God which is in your care, using your authority, not as forced to do so, but gladly; and not for unclean profit but with a ready mind;

Be serious and keep watch; the Evil One, who is against you, goes about like a lion with open mouth in search of food;