Is it permissible to feed ten indigent persons, or to fast three days, or to free a slave as expiation for false oaths that were sworn but not fulfilled?

Sincere repentance completely erases sins, except for the rights of people, which must be returned. The expiation for oaths is feeding or clothing ten poor persons or freeing a slave; if one is unable, then fasting for three days. As for the false oath (al-yamin al-ghamūs), most scholars hold that no expiation is required for it, and repentance and seeking forgiveness suffice, while Al-Shafi'i and some Hanbalis are of the opinion that expiation is obligatory for it.