There are plenty of Scriptures about the poor and oppressed...including the ones about orphans and widows who were, as fate would have it, poor and oppressed. Jeremiah 22:3 and Isaiah 1:17 are pretty clear...and there are others.
Galatians 3 also seems to have something to say about all this.
Open borders? Nah, but compassion, grace, and care...without a doubt.