And he came to Nazareth, where he had been brought up. And as was his custom, he went to the synagogue on the Sabbath day, and he stood up to read. And the scroll of the prophet Isaiah was given to him. He unrolled the scroll and found the place where it was written,
“The Spirit of the Lord is upon me,
because he has anointed me
to proclaim good news to the poor.
He has sent me to proclaim liberty to the captives
and recovering of sight to the blind,
to set at liberty those who are oppressed,
to proclaim the year of the Lord's favor.â€
And he rolled up the scroll and gave it back to the attendant and sat down. And the eyes of all in the synagogue were fixed on him. And he began to say to them, “Today this Scripture has been fulfilled in your hearing.†(Luke 4:16-21 ESV)
And he lifted up his eyes on his disciples, and said:
"Blessed are you who are poor, for yours is the kingdom of God. Blessed are you who are hungry now, for you shall be satisfied. Blessed are you who weep now, for you shall laugh. Blessed are you when people hate you and when they exclude you and revile you and spurn your name as evil, on account of the Son of Man! Rejoice in that day, and leap for joy, for behold, your reward is great in heaven; for so their fathers did to the prophets."
“But woe to you who are rich, for you have received your consolation. Woe to you who are full now, for you shall be hungry. Woe to you who laugh now, for you shall mourn and weep. Woe to you, when all people speak well of you, for so their fathers did to the false prophets." (Luke 6:20-26 ESV)
Especially...
And he told them a parable, saying, “The land of a rich man produced plentifully, and he thought to himself, ‘What shall I do, for I have nowhere to store my crops?’ And he said, ‘I will do this: I will tear down my barns and build larger ones, and there I will store all my grain and my goods. And I will say to my soul, “Soul, you have ample goods laid up for many years; relax, eat, drink, be merry.â€â€™ But God said to him, ‘Fool! This night your soul is required of you, and the things you have prepared, whose will they be?’ So is the one who lays up treasure for himself and is not rich toward God.†(Luke 12:16-21 ESV)
...and lots and lots of other passages contrasting the rich and the poor.