The one who lies under oath in court: Is there an expiation for him, and what is the oath of perjury?

Question : Please. Peace be upon you. And upon you be peace. If a person takes an oath in court, O Honorable Shaykh, and he is lying, is there an expiation for him?

Answer : There is no expiation for him, but if it entails depriving a Muslim of his right, it is the oath of perjury in which a person meets his Lord while He is angry with him (Mighty and Majestic). This is because the expiation is only for an oath regarding a future matter. For example, if one says, "By Allah, I will not do this thing," and then does it, or says, "By Allah, I will do this thing," and then does not do it. The oath that requires expiation is the one concerning the future. As for the past, if he was truthful, he owes nothing; if he was lying, he has sinned. Yes. And if it involved encroaching on a Muslim's right, it is an oath of perjury. Yes. May Allah reward you.