The theme that the speaker is conveying with the descriptions of what the lord says is that rescuers from the network of the underground railroad are on their way.
The phrase "Go Down Moses" refers to events in the Bible's Old Testament, particularly the Exodus. The mandate to go to Pharaoh and tell him, "Thus saith the LORD, Let my people go, so they may serve me," is given by the LORD to Moses. Moses is to demand that the Israelites be freed from slavery in Egypt.
The song touches on ideas of liberation, which are prevalent in spirituals. The song actually contained several themes, including those about the freedom of runaway slaves as well as the freedom of Israelites, and many slave owners forbade it because of these very messages.
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