...The book is to be given only to one who is pious, and a teacher, and circumcised, and even then only a part at a time. A form of promise (not an oath, which is unlawful) is prescribed for the reader, by heaven, earth, water, and air, that he will take extraordinary care of the writings and communicate them to no one; he invokes upon himself terrible curses in case he should be unfaithful to this covenant. The most curious passage is: "Even if I should come to acknowledge another God, I now swear by him, whether he exist or not."