Proverbs 14:31 (ESV)
31 Whoever oppresses a poor man insults his Maker, but he who is generous to the needy honors him.
Proverbs 31:8–9 (ESV)
8 Open your mouth for the mute, for the rights of all who are destitute. 9 Open your mouth, judge righteously, defend the rights of the poor and needy.
Proverbs 28:15–16 (ESV)
15 Like a roaring lion or a charging bear is a wicked ruler over a poor people. 16 A ruler who lacks understanding is a cruel oppressor, but he who hates unjust gain will prolong his days.