Does one fall into disbelief or sin if he says to his friend who asked him for a testimony in a joking context: "Don't say that, it is forbidden," intending to prevent joking about religious matters, not to forbid the testimony itself? Or if he says to him: "Forbidden, this is a book of Fiqh" with a smile upon seeing him carelessly throw a book of Fiqh, due to fear of mockery or ridicule of religion?