For there is no divination in Yaakov, and no sorcery in Israel; in due time it is said to Yaakov and to Israel what God has wrought.
Torah Temimah: Nedarim 32a — Rabi: whoever practices divination, divination comes upon him.
English: It was taught: Rabi said: Whoever practices divination — divination comes upon him, as it is said, “For there is no divination in Yaakov.” But it is written with lamed-alef [לא]? Rather, because of measure for measure.
Measure-for-measure reading of the negation of divination.
Israel’s freedom from sorcery is also a warning: one who adopts divination invites it upon himself.