Ezek. 16:49ff. "Behold, this was the guilt of your sister Sodom: she and her daughters had arrogance, abundant food, and careless ease, but she did not help the poor and needy. Thus they were haughty and committed abominations before Me. Therefore I removed them when I saw it."
Is. 10:1-3. "Woe to those who enact evil statutes, and to those who continually record unjust decisions, so as to deprive the needy of justice, and rob the poor of My people of their rights... Now what will you do in the day of punishment, and in the devastation which will come from afar?"
Luke 1:52ff.[Mary's Magnificat.] "He has brought down rulers from their thrones, and has exalted those who were hungry. He has filled the hungry with good things; and sent away the rich empty-handed."
Ezek. 22:29,31. "The people of the land have practiced oppression and committed robbery, and they have wronged the poor and needy and have oppressed the sojourner without justice... Thus I have poured out My indignation on them; I have consumed them with the fire of My wrath; their way I have brought upon their heads," declares the Lord GOD.
Jer. 5:28f. "[The wicked] do not plead the cause, the cause of the orphan, that they may prosper; and they do not defend the rights of the poor. Shall I not punish these people?" declares the LORD. "On such a nation as this, shall I not avenge myself?"
James 5:1-6. Come now, you rich, weep and howl for your miseries which are coming upon you. Your riches have rotted and your garments have become moth-eaten....Behold, the pay of the laborers who mowed your fields, and with you have withheld, cries out against you; and the outcry of the harvesters has reached the ears of the Lord of Sabaoth. You have lived luxuriously on the earth and led a life of wanton pleasure; you have fattened your hearts in a day of slaughter.
Luke 6:24. "But woe to you who are rich, for you are receiving your comfort in full."
Luke 16:19-25. "Now there was a certain rich man, and he habitually dressed in purple and fine linen, gaily living in splendor every day. And a certain poor man named Lazarus was laid at his gate, covered with sores, and longing to be fed with the crumbs which fell from the rich man's table; besides, even the dogs would come and lick his sores.
Now it came about that the poor man died and he was carried away by the angels to Abraham's bosom; and the rich man also died and was buried. And in Hades, being in torment, he lifted up his eyes, and saw Abraham far away, and Lazarus in his bosom.
And he cried out and said,'Father Abraham, have mercy on me, and send Lazarus, that he may dip the tip of his finger in water and cool off my tongue; for I am in agony in this flame.'
But Abraham said,'Child, remember that during your life you received your good things, and likewise Lazarus bad things; but now he is being comforted here, and you are in agony...'"
Commentary: Many Evangelicals worry what might happen to our country if sexual immorality flourishes. Now, the sexual morality the Bible tells us to be worried about is our own, but that's another discussion. A more serious worry is what will happen to us, our churches, our nation, if we don't serve the poor.
Obviously, adding to the misery of the poor is bad-- exploiting workers, oppressing immigrants, robbing the needy. But it doesn't stop there. Merely ignoring the poor is a crime. Sodom wasn't destroyed because of sexual immorality; it was destroyed because it "had arrogance, abundant food, and careless ease"-- and isn't that a pretty good description of America?-- and it "did not help the poor and needy".