One Law Could Put Israel At Risk

One Torah law put Am Yisrael at risk During the time of Roman persecution, but the Sages refused to change or hide it. Rabbi Yaron Reuven brings confusing teachings from the Gemara and answers the questions: Are we allowed to lie to the gentiles? Are we allowed to change the Torah if it's Pikuach Nefesh? The answers reveal the importance of learning and having a Rabbi.