The Book of Oath, Penance, and Vows

Question: If a man says, “I am a Jew” or “I am a Christian if I do such-and-such,” is he judged thereby to have disbelieved and his wife to have been divorced, even if he does not do the act...

Question: Is it permissible to administer an oath by (saying) disavowal from Allah or from Islam? And what is the ruling regarding one who swears by that, whether truthful or breaking his oath?

Question: If it is said to a man, “Do such-and-such,” and he replies, “Ḥarām (forbidden),” what is the ruling of that?

Question: If a person says, “By Allah, I will indeed do (it)” (wa-llāhi la-afʿalu, with the verb in the nominative), intending thereby to remove it from being an oath, then what is the ruling of this grammatically faulty oath?