The Ruling on Expiation for One Who Swears by a Created Being

The Shaykh : Second, if a man swears by other than Allah, saying, "By the Prophet, I will not do this thing," and then he does it, does he have to pay an expiation or not?
He does not have to pay an expiation, because the obligation of expiation is contingent upon the validity of the oath. The oath here is not valid. Therefore, there is no expiation, but he must repent. He must repent to Allah (Mighty and Majestic) and cease. However, if he swears by a created being, yes, by a created being that is worshipped, then he has to pay an expiation. If he swears by a created being that is worshipped, he has to pay an expiation.
If he swears by al-Lat, al-Lat being an idol that is worshipped. The Prophet (peace and blessings be upon him) said: This is its expiation. The first is shirk (associating partners with Allah) with al-Lat, and "There is no god but Allah" is sincerity.