Cytowanie Komentarza do Powtórzonego Prawa 4:9

שמע אברהם בקולי, "Abraham hearkened to My voice." He successfully passed all the tests I subjected him to; וישמור משמרתי, he was careful not to transgress anything l had commanded him even unintentionally, through momentary carelessness. וחוקותי, these are the commandments that appear to be without logical foundations. תורתי, "he studied My commandments in order not to forget them," just as Moses commanded Israel in Deut. 4,9.

This concept has already been explained to you: separating from something indicates that the one who separates is the opposite of what they are separating from, just as fire withdraws from water because fire is the opposite of water. Since the Torah is intellectual, and the intellect has a complete and enduring existence—unlike matter, which lacks complete existence and is connected to absence or deficiency, as we have explained extensively—therefore, one who separates from the Torah is the opposite of existence. There is no greater existence than that of the Torah. Thus, one who forgets even a single matter from their learning is considered as endangering their life.

Rabbi Dostai beRebbe Yannai in the name of Rabbi Meir says: Anyone who forgets one thing from his studies - Scripture considers him as if he is liable for [forfeiture of] his life, as it is said (Deuteronomy 4:9): "Only guard yourself, etc.: As he did not put it into his heart to say that forgetting is common with people. He should have reviewed the law many times and be thinking about it the whole day and the whole night, until it could not leave his heart. And [as] he did not, he is liable for [forfeiture of] his life; since he will come to give rulings according to his memory and say, "So said Rabbi." And [so] he will forbid the permissible and permit the forbidden and a mishap will come from his hand; and he will be called a sinner, 'for an error in study is considered an intentional transgression.'