Can the Cushite change his skin?

"Can the Cushite change his skin?" is a rhetorical question in Jeremiah 13:23 implying that the people of Cush had a very different skin colour from the average Israelite. This was not a derogatory comment.

This Sunday we look at Psalm 87, where these people (along with a bunch of others who are not Israelites) are described this way:

Psalm 87:6 The LORD will write in the register of the peoples: “This one was born in Zion.”

It is staggering that God includes in his chosen people groups and nations from everywhere! Even in the Old Testament this was the expectation that God had raised.