Explanation

The meaning in a few plain lines

The Oxus, the Jaxartes, the Euphrates, and the Nile are four rivers in this world, which the Prophet (may Allah's peace and blessings be upon him) described as being from the rivers of Paradise. Some scholars said that they are literally from the rivers of Paradise. However, when these rivers were put in this world, they earned the character of worldly rivers and became from the rivers of this world.