Were the kingdoms Satan showed Jesus real or spiritual?
The kingdoms Satan showed Jesus were real, earthly kingdoms of this world, not ethereal or invisible spiritual entities. The context of Matthew 4:8 describes the devil showing Him all the kingdoms of this world, and the surrounding discussion identifies them with actual historical empires such as Egypt, Babylon, Medo-Persia, Greece, and Rome.
Les teaches that Matthew 4:8 occurs during Jesus' temptations after His forty days of fasting. The devil took Him up into an exceeding high mountain and showed Him all the kingdoms of this world. Les stresses that this is not something ethereal or invisible but the kingdoms of this world. From that point in history, great kingdoms had already come and gone, including some of the great pharaohs of Egypt, the Babylonian Empire, the Medean Persian Empire, the glorious Empire of Greece, and Rome at its height. The offer therefore concerned real, literal world empires, not merely spiritual or invisible things.
Again, the devil taketh him up into an exceeding high mountain, and sheweth him all the kingdoms of the world, and the glory of them;
More Questions
What great kingdoms had risen and fallen by the time of Jesus?
By the time Satan tempted Jesus, Egypt, Babylon, Medo-Persia, and Greece had come and gone, and Rome was at its peak.
Why didn't Jesus worship Satan to get the kingdoms of the world?
Jesus was not tricked by Satan because Jesus knew He would receive the kingdoms anyway, so He did not need to fall down and worship Satan to get them.