'Watch' in the Bible

And there were shepherds in the same region, living out of doors and keeping watch, guarding over their flock by night.

And he said to them, "Watch out and guard yourselves from all greediness, because not [even] when someone has an abundance {does} his life [consist] of his possessions."

Even if he should come back in the second or in the third watch of the night and find [them] like this, blessed are they!

And he said, Watch out that you are not deceived! For many will come in my name, saying, 'I am [he],' and 'The time is near!' Do not go after them!