Kabbalah zu Mischlej 6:26

Similarly it says in the Faithful Sheppard in the Zohar in Pinchas B: 600. And in the first part, the Faithful Shepherd said: Whoever treats lightly crumbs of bread and throws them where they should not be, and even more so one who treats lightly pieces of marrow, that are drops of seed, and throws them on the ground, it is said about them: “for all flesh had corrupted its way upon the earth” (Beresheet 6:12). Or he who throws them to a menstruating woman, or the daughter of an idolater, or a bondwoman or a prostitute, and much more so one who treats lightly the crumbs of the bread of the Torah, which are THE SECRETS THAT ARE IN the tips of the letters and the crowns of the letters, about these it is said: He that makes worldly use of the crown shall perish. 601. And how much more so whoever transmits secrets of the Torah and the secrets of the Kabbalah and the secrets of the Works of Creation or secrets of the letters of the explicit Name to people who are not worthy, who are in the control of the Evil Inclination, a harlot, about whom it is written: “For by means of a harlot a man is brought to a piece of bread” (Mishlei 6:26). And whenever bread is mentioned the meaning is the 22 letters of the Torah, and whenever ‘piece’ is mentioned the meaning is even a single Halachah.