Question 10: I swore to slap my sister for some reason, but I retracted this after I had calmed down. A few days after, I swore to do another thing without having expiated for my first oath, I asked a shaykh whether I have to offer the Kaffarah (expiation) once or twice? He told me that if I made another oath before expiating for the first one, then I should offer a Kaffarah once. However, I asked another shaykh about this, but he told me that I should offer the Kaffaarah twice.
Answer: You should offer the Kaffaarah twice, for the first oath was different from the second one… read more here.