What is the Islamic ruling regarding saying “Wallah” or like promising saying I swear by Allah when it’s not the truth or like the one who said it lying. I heard it has a kafarrah for fasting for 3 days, is this true? My marja is Sayed Sistani what does he say regarding this issue? Also is the kaffarah wajib to do meaning what if I don’t do it? Will I go to hell?

Someone who says qasam falsely should feed ten poor people each (750) grams of wheat or bread

What is the Islamic ruling regarding saying “Wallah” or like promising saying I swear by Allah when it’s not the truth or like the one who said it lying. I heard it has a kafarrah for fasting for 3 days, is this true? My marja is Sayed Sistani what does he say regarding this issue? Also is the kaffarah Wajib to do meaning what if I don’t do it? Will I go to hell?

If one makes an oath by saying Wallahi to do something (which is allowed and acceptable in Sharia—not something that’s haram or undesired), and the person does not honor the oath, then he must ask Allah for forgiveness and also pay Kaffara. The Kaffara is feeding ten poor people, and if one is unable to do so (he is very poor), then it would be to fast three days.