Midrasch zu Wajikra 18:4

(Ib. b) Our Rabbis were taught: (Lev. 18, 4) My ordinances shall ye do. This signifies such ordinances which, even were they not written, ought to be observed as though written; they are, idolatry, adultery, bloodshed, robbery, and blasphemy. (Ib.) And my statutes shall ye keep, refers to things that Satan and others argue against; as, for instance, abstaining from pork, from wearing cloth mixed of wool and linen, Chalitza, purification of a leper, the despatching of the scapegoat and the Para Aduma. Perhaps thou wilt say they are acts of vanity; it is therefore said (Ib.) I am the Lord, your God; i.e., I am the Lord who have commanded it; you must not criticize.

R. Samuel the son of Nahmani said that R. Jonathan stated: Whoever rebukes his companion for religious reasons earns a share of divine grace, as it is said: He that rebuketh a man shall in the end find more favor (Prov. 28:23). And furthermore a thread of divine favors will be drawn about him, as is said: He shall find favor. Scripture says: Mine ordinance shall ye do (Lev. 18:4). These are ordinances which, if they were not enumerated in the Torah, ought to have been. Scripture is speaking here of idolatry and blasphemy. My statutes shall ye keep, to walk therein (ibid.). These are the commandments against which the evil inclination contends, and against which the peoples of the earth rebel. These are: the wearing of garments made of wool and linen,¹²The law of shatnez; see Lev. 19:19. This commandment and all the following ones are disregarded as irrational by non-Jews. the eating of pig,¹³See Lev. 11:7. the spittle of a childless sister-in-law,¹⁴After one has refused to marry his brother’s widow under the law of levirate marriage; see Deut. 25:5–10. mixing seeds,¹⁵Deut. 22:9–11. stoning an ox for killing a human being,¹⁶Exod. 21:29. the heifer whose neck was broken,¹⁷Lev. 14:1–21. the bird sacrifice brought by a leper,¹⁷ a firstling of an ass,¹⁸Exod. 13:13. meat prepared in milk,¹⁹Exod. 23:9. and the goat that has been sent away (the scapegoat).²⁰Lev. 16:1–34. Azazel, the area where the scapegoat would perish. You might maintain that these are unimportant prohibitions. Hence Scripture says: I am the Lord: I have decreed them, and you art not permitted to repudiate them.

9) (Vayikra 18:4) ("My judgments you shall do, and My statutes you shall heed to walk in them; I am the L–rd your G d.") "My judgments" — these are the laws; "My statutes" — these are the midrashoth (exegetical derivations); "you shall heed" — this is the Mishnah; "to walk in them" — this is the deed; "shall you heed to walk in them" — It is not the Mishnah which conducts you (to the world to come), but the deed.