'Poor' in the Bible

Yahweh makes poor, and makes rich. He brings low, he also lifts up.

He raises up the poor out of the dust. He lifts up the needy from the dunghill, To make them sit with princes, and inherit the throne of glory. For the pillars of the earth are Yahweh's. He has set the world on them.

Saul's servants spoke those words in the ears of David. David said, "Does it seems to you a light thing to be the king's son-in-law, since I am a poor man, and lightly esteemed?"