'Darkness' in the Bible

So the Arameans got up and ran away in the gathering darkness. They left behind their tents, horses, and donkeys just as they were and fled for their lives!

When these lepers came to the edge of the camp, they went into one tent and ate and drank, and carried away from there silver, gold, and clothing, and went and hid them. Then they went back and entered another tent and carried [some valuable things] from there also, and went and hid them.