'Poor' in the Bible

The LORD maketh poor, and maketh rich: he bringeth low, and lifteth up.

He raiseth up the poor out of the dust, and lifteth up the beggar from the dunghill, to set them among princes, and to make them inherit the throne of glory: for the pillars of the earth are the LORD'S, and he hath set the world upon them.

And when the Philistine, taking note, saw David, he had a poor opinion of him: for he was only a boy, red-haired and good-looking.

And Saul's servants spake those words in the ears of David. And David said, Seemeth it to you a light thing to be a king's son in law, seeing that I am a poor man, and lightly esteemed?