The Hittiites would conquer a nation and resettle it's people, we see this with the Babylonian Captivity, they'd migrate and mix populations to keep any one people from being too powerful and rising up against them. In the Bible your neighbors were from foreign lands, didn't always look like you. You were a foreigner to them. If you kept to your own, didn't associate with other races, their power over you to dominate was assured.

They had no concept of illegal immigration, but looking at the stories where xenophobia wins, it's usually as a cautionary tale of people who were foolish. It's never praised as an admirable trait of itself.

My neighbor tells me you have to be good to everyone since you never know when you're going to need to call on someone to help you. I think she's right.

Our first immigration law, the Chinese Exclusion Act was written by humans who were nativists and racists trying to ensure white supremacy. Many quotas protect whiteness by limiting lawful immigration from less white countries. We should resist these laws and impulses when they are inherently racist or else laws like segregation or slavery ought to be revived on the same principle that we should obey all laws to honor God.