You asked

where else in the bible is the relationship between rich and poor addressed, and how?

The passage, plainly, with room to sit with it.

Deuteronomy 15:7-8

“If there is with you a poor man, one of your brothers, within any of your gates in your land which Yahweh your God gives you, you shall not harden your heart, nor shut your hand from your poor brother; but you shall open your hand wide to him, and shall surely lend him sufficient for his need, in that which he wants.”

This passage is part of Moses' address to the Israelites as they prepare to enter the promised land, laying out laws and principles for how they are to live as a community under God. It emphasizes care for the vulnerable among them.

what responsibilities does community membership imply for those who have more toward those who have less?

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Read alongside it

Proverbs 28:27
He who gives to the poor will not lack; but he who hides his eyes will have many a curse.
Luke 12:16-21
The parable of the rich fool highlights the danger of accumulating wealth without generosity or thought for one's ultimate end.
James 2:1-7
This passage challenges the church community not to show favoritism to the rich over the poor, stressing the connection between faith and action.

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