Midrash su Zaccaria 10:4

(Fol. 56b) There is a verse (Deut. 32, 6) Hath He not made thee, and established thee? From this it may be inferred that the Holy One, praised be He! has created carefully arranged chambers in man, one of which if disturbed, man cannot live. We are taught in a Baraitha that R. Mair would say: "Hath He not made thee, and established thee? This means: A community in which everything (all classes) can be found; from its own midst they have priests, from its own midst they have prophets, and from its own midst they have princes, as it is said (Zech. 10, 4) Out of them shall come forth the corner-stone, out of them the stake, etc. There was a Roman who noticed that a man fell off the roof causing through the fall a rupture in his belly through which his entrails came out. He immediately brought a son of the injured, whom he slaughtered in a fictitious way (Fol. 57). The father became faint and began to sigh, which caused him the return of his entrails. The Roman thereupon sewed up his belly.

"He made you, and He established you (vayechonanecha)": R. Meir says: (Israel is) a city that has everything: its Cohanim, from its midst; its prophets, from its midst; its scribes, from its midst. And thus is it written (Zechariah 10:4) "from him, the cornerstone; from him, the peg, etc." R. Yehudah says (on "vayechonanecha" above): He made you with apertures (chevayin [as in "vayechonanecha"]). R. Shimon b. Yehudah says (on " vayechonanecha"): He settled you on your foundation: He fed you of the spoils of the seven nations; He gave you what He swore to you; and he caused you to inherit what He promised. R. Dostai b. Yehudah says: He made you with internal chambers ("kinunim, kinunim) in such manner that if one of them rises above the other, you will not be able to stand.