Is there an expiation for the oath that plunges one into sin?

Question:
Does the oath that plunges one into sin have an expiation?

Answer:
The oath that plunges one into sin has no expiation. Its sin is greater. Expiation is for what is easier, such as when one says in the future that he will not do something and then does it, or leaves it off and then does it, or says he will not do it and then does it.
As for the oath that plunges one into sin, it is grave. If one commits it, he must repent to Allah and return the right to its owner. For example, if he says, "By Allah, I have nothing for you," while he actually has something for him—perhaps he lent him a thousand riyals, or more, or less—and then the man demands his right and says, "I have nothing for you, I did not lend you anything," and he has no proof, and the man had a good opinion of him and does not testify against him, and he swears that he has nothing for him, then this is the oath that plunges one into sin. This is of that kind; this is one of its examples. If Allah guides him, he returns the right to its owner and repents to Allah, and that is sufficient.
Q: If he hints and says, "You have no right with me..."?
A: And is he lying, or is he truthful? Does he have a right with him? This is an oath that plunges one into sin if he swears to it; because the right may be a loan, it may be a debt, it may be a loan for use that he betrayed, or a trust that he betrayed. It depends on his intention.