הלכה אויף שיר השירים 4:11

The ancient sages have commanded not to sermonize concerning these matters;⁴Ibid. C. save only to one man at a time, if he be wise, possessed of an intelligence of his own, whenafter to him might be transmitted the headlines of the chapters and acquaint him with a fraction of the matter so that he be able to understand its conclusion by his own intelligence and fathom its depth. These matters are extremely deep matters indeed, and not each and every intelligence is prepared to suffer them. And concerning them Solomon in his wisdom metaphorically said: "The lambs will be for thy clothing" (Prov. 27,26); so have the sages interpreted this metaphor: "matters which are covering the universe shall be for thy garment," meaning they are a garment for thee alone, but thou shalt not sermonize them before the multitude. And, concerning them he further said: "Let it be for thee alone and for no strangers with thee," (Ibid. 5,17). And concerning them he, moreover, said: "Milk and honey shall be beneath thy tongue;" (Song of Songs, 4,11); so have the early sages interpreted it: "Matters which are likened to honey and milk shall remain beneath thine own tongue".

It is also customary of eating honey and milk on Shavuot because the Torah is compared to honey and milk as it is written "honey and milk under your tongue" (Songs 4:11)

On the first day of Shavuos it is customary to eat dairy foods. There are several reasons for this. A hint of this custom is found in the words, Minchah chadashah LaShem beshavuoseichem.¹⁶Numbers 25:26. The initials of these words spell meichalav—"of milk." You should also eat foods with honey, because the Torah is compared to milk and honey, as it is said,¹⁷Shir Hashirim 4:11. "Honey and milk are under your tongue." Now, since we eat dairy foods and we must also eat meat, because it is a mitzvah to eat meat on every Yom Tov, care must be taken not to violate the law of mixing the dairy and meat foods.