Well, for starters, these guys:
New Testament passages
"Jesus answered, If you want to be perfect, go, sell your possessions and give to the poor, and you will have treasure in heaven. Then come, follow me.'" Matthew 19:21
"For I was hungry and you gave me something to eat, I was thirsty and you gave me something to drink, I was a stranger and you invited me in." Matthew 25:35
"They devour widows' houses and for a show make lengthy prayers. Such men will be punished most severely." Mark 12:40
"The Spirit of the Lord is on me, because He has anointed me to preach good news to the poor. He has sent me to proclaim freedom for the prisoners and recovery of sight for the blind, to release the oppressed." Luke 4:18
"So he replied to the messengers, Go back and report to John what you have seen and heard: The blind receive sight, the lame walk, those who have leprosy are cured, the deaf hear, the dead are raised, and the good news is preached to the poor.'" Luke 7:22 [ E-book: The Kingdom strikes back ]
"Sell your possessions and give to the poor. Provide purses for yourselves that will not wear out, a treasure in heaven that will not be exhausted, where no thief comes near and no moth destroys." Luke 12:33
"But when you give a banquet, invite the poor, the crippled, the lame, the blind." Luke 14:13
"When Jesus heard this, he said to him, You still lack one thing. Sell everything you have and give to the poor, and you will have treasure in heaven. Then come, follow me.'" Luke 18:22
Bible: Caring for and serving the poor