Is It Wrong to Lie in Order to Ward Off Harm?
Lying to ward off harm is not right unless it amounts to an explicit disavowal of the other person’s act, and it drains one’s spiritual reserves. It is better to refuse the request outright than to lie, so the other person may recognize the wrongness of what they intend to do. If the car is broken, say so plainly, without implying that you would lend it if it were in working order.