'People of God' in the Bible

And the chief of all the people, even of all the tribes of Israel, presented themselves in the assembly of the people of God, four hundred thousand footmen that drew sword.

And the woman said, Wherefore then hast thou thought such a thing against the people of God? for the king doth speak this thing as one which is faulty, in that the king doth not fetch home again his banished.

Now when they were gone unto the Heathen, and come in among them they dishonoured my holy name: so that it was said of them, 'Are these the people of God, and must go out of their own land?'