Immigration

When a stranger resides with you in your land, you shall not wrong him. The stranger who resides with you shall be to you as one of your citizens; you shall love him as yourself, for you were strangers in the land of Egypt: I the LORD am your God.

God gathered the dust [of the first human] from the four corners of the world - red, black, white and green. Red is the blood, black is the innards and green for the body. Why from the four corners of the earth? So that if one comes from the east to the west and arrives at the end of his life as he neared departing from the world, it will not be said to him, "This land is not the dust of your body, it's of mine. Go back to where you were created." Rather, every place that a person walks, from there he was created and from there he will return."