What is the expiation for one who swears by Allah falsely, and what is the meaning of His, the Almighty's, sayings: "By the heaven full of pathways" and "Destroyed are the liars"?

The interpretation of the verse: (وَالسَّمَاءِ ذَاتِ الْحُبُكِ) means the heaven with paths in which the planets move, or the beauty of its creation, its adornment, and its stars. It was also said to refer to the seventh heaven or the clouds. And the interpretation of the verse: (قُتِلَ الْخَرَّاصُونَ) means those who are doubtful, or soothsayers, or those who fabricate lies against the Messenger of Allah, peace and blessings be upon him. Its meaning is a supplication against them.