לֹ֥א תֹאכְל֖וּ עַל־הַדָּ֑ם לֹ֥א תְנַחֲשׁ֖וּ וְלֹ֥א תְעוֹנֵֽנוּ׃
Ne faites point de repas près du sang; ne vous livrez pas à la divination ni aux présages.
English Explanation of Mishnah Makkot
Introduction Mishnah five discusses the various prohibitions of shaving one’s head either as a sign of mourning (Leviticus 21:5, Deuteronomy 14:1) or in general (Leviticus 19:26). These prohibitions are punishable by flogging.
Rabbeinu Yonah
The drasha that we make from the verse "You shall not eat with the blood" (Vayikra 19:26) that you may not eat before you pray for your blood is just an asmachtah, as the explanation of the passuk is that someone can't eat meat while the blood is still in it.
Haamek Sheilah
[We must analyze this gemara] in order to understand it properly, for the rule itself [that one verse can be interpreted in various ways to derive many laws], is, in turn, derived from two different verses. [However], it is impossible to understand the gemara in this manner, for it states immediately above that a single rule or law cannot be derived from more than one verse. Therefore, the [two different verses] actually reflect two different aspects of this rule. There is one situation in which there is no disagreement among those who interpret the verse in numerous ways. For [although] they may derive various interpretations from the same verse, each agrees [that the other scholar’s] interpretation is valid. For example, regarding the verse, “You shall not eat [the sacrifices] with the blood,”9Lev. 19:26. the Toras Kohanim10Toras Kohanim, which is also known as the Sifra, is a tannaitic midrash halacha on the Book of Leviticus. [on that verse] and Tractate Sanhedrin 63a derive numerous prohibitions.11Toras Kohanim and Tractate Sanhedrin cite five different prohibitions inferred from these words: 1) not to eat sacrificial meat before its blood has been sprinkled; 2) not to eat the flesh of an unsanctified animal before it dies; 3. not to offer a “meal of comfort” (first meal eaten by the mourners after a funeral) to relatives who are mourning the death of a person executed by the Sanhedrin; 4) if one is a member of a Sanhedrin that sentenced a person to death, not to eat that entire day; 5) if one is a stubborn and rebellious son; not to eat in a manner that will cause him to shed blood. All these [inferences] are derivations of the true law; none contests [the validity] of the other. In addition, it is possible that the same sage can derive many laws from one verse. [Tractate Sanhedrin] 103b states that “Menashe taught fifty-five different approaches to understanding Toras Kohanim12Toras Kohanim literally means “Priestly Laws.” In this context it is the Book of Leviticus. [Leviticus], while Ahav derived eighty-five different approaches, and Yerovam derived one hundred and three different interpretations.”
Rashi
But if they say [to us], 'Come up to us.' A fear inspired by the Holy One, Blessed is He, is in their heart and they are afraid to move from their place.4Although there is a prohibition against resorting to omens in Vayikra 19:26, Tosfos in Maseches Chulin 95b explains that Yonoson himself did not believe in the sign, he only made it to encourage his weapon bearer. See Radak.