Query: Salam Alykoum Mulana. In response to your answer to question number xx since you mentioned that the oath has nothing to do with Islamic Sharia. Does that mean I didn’t not commit any act of apostasy (kufur) when I signed the oath and repeated it verbally?
Dear brother, A Muslim should not swear by other than Allah. The prophet (peace be upon Him) said, “Whoever has to take an oath should swear by Allah or remain silent.” Sahih al-Bukhari 2679.
Therefore, we are saying that a Muslim should not take an oath that he is going to do something against what’s known of religion and he shouldn’t swear with something that make the lawful unlawful or the unlawful lawful.
The prophet (peace be upon him) said, “Muslims will be held to their conditions, except the conditions that make the lawful unlawful, or the unlawful lawful.”
Sources: Al-Azhar Al-Sharif