What is the expiation for swearing falsely in an administrative investigation concerning the husband, with coercion and without harming anyone?

Lying is forbidden (haram); it leads to immorality and Hellfire. It is only permitted out of necessity or for a legitimate Sharia interest that cannot be achieved otherwise. If lying is coupled with an oath, it is a perjurious oath (al-yamin al-ghamus), which is one of the greatest major sins. The majority of scholars believe it is too grave to be expiated, so its perpetrator must engage in sincere repentance and perform many good deeds. Some scholars are of the opinion that an expiation for an oath is required (feeding ten poor people, or clothing them, or freeing a slave, or fasting three days). If the lie results in material harm to others, then the right must be restored.