Midrash sobre Exodo 23:16

(Exodus 12:2) "The beginning of the months": We are hereby apprised that Nissan is the beginning for the months. And whence do we derive (the same for) the reign of kings? From (I Kings 6:1) "In the fourth year of Solomon's reign over Israel, in the month of Ziv (Iyyar), the second month," (his reign having begun with the first month, Nissan). And whence do we derive (the same for) festivals (i.e., that one is not in transgression of delaying his vows until three consecutive festivals have passed)? From (Devarim 16:16) "… the festival of matzoth (in Nissan), and the festival of Shavuoth, and the festival of Succoth." We find, then, that Nissan is the beginning for months, for kings, and for festivals. R. Nathan and R. Tzaddok say: Also for house rentals (i.e., If one says: I am renting it to you for this year, the understanding is until the beginning of Nissan.) But this does not apply to (the reckoning of) years, shemitah, Yovloth, planting (in respect to arlah [viz. Leviticus 19:23]) or (the tithing of) greens, in which respect it is written (Devarim 31:10-11) "At the end of seven years, in the time of the year of the shemitah … when all of Israel, etc.", and (Exodus 34:22) "and the festival of the ingathering, the circuit of the year."

8) And whence is it derived that they (the two loaves) precede the (bringing of) the first-fruits (bikkurim)? From (Shemoth 34:22): ("And the festival of Shavuoth shall you make for yourself,) the first of the wheat harvest" (i.e., What you make on Shavuoth [the two loaves] should precede [all that comes of] the wheat harvest.) This tells me (that it precedes only bikkurim) of wheat. Whence do I derive (that it precedes also bikkurim) of barley? From (Shemoth 23:16): "which you sow" (implying all that you sow.) This tells me only of what is sown. Whence do I derive (that the two loaves precede) what grows of itself (from seeds scattered by the wind)? From (Shemoth 23:16): "in the field" (implying all that grows in the field.) This tells me only of what grows in the field. Whence do I derive the same for (fruits planted on) a roof, in a yard, or in a ruin? From (Bamidbar 18:13): (The two loaves shall be) "the first-fruits of all that is in their land." And whence is it derived that they precede the (bikkurim of) libations and the fruits of the tree? From (Bamidbar 23:16): (The two loaves shall be) "the first fruits of your labor," and (Bamidbar 23:16): "when you gather your labor from the field." (Grapes for libations and fruits are subsumed in "gathered.")

What is written following this? Three times thou shalt keep a festival unto Me in the year (ibid., v. 14). The Holy One, blessed be He, established the festival of unleavened bread, on which He performed miracles in their behalf in Egypt; the harvest festival (Shavuot), on which He gave them the Torah, the fruits of which they were to enjoy in this world and their interest in the world-to-come, as it is said: My fruit is better than gold, yea, than fine gold; and My produce than choice silver (Prov. 8:19); and the feast of ingathering (Sukkoth), on which the Holy One, blessed be He, fills their homes with blessings, as is said: Honor the Lord with thy substance, and with the first-fruits of all thine increase; so shall thy barns be filled with plenty, and thy vats shall overflow with new wine (Prov. 3:9–10). Thus it is said: The choicest first-fruits of thy land thou shalt bring into the house of the Lord thy God (Exod. 23:19).

(Devarim 16:10) "And you shall make a festival of weeks (shavuoth) to the L-rd your G-d": Because it is written (Shemoth 23:16) "And the festival of the harvest (Shavuoth) the (time of bringing the) first-fruits of your labor," I might think, if you "harvest, you make a festival, and if not, you do not make a festival; it is, therefore, written "and you shall make a festival of weeks to the L-rd your G-d" — Whether or not you have a harvest, you make a festival.

"that you bring from your land": so long as they are found on the face of the land. I might think he may bring them before Shavuoth, it is, therefore, written (Shemoth 23:16) "And the feast of the harvest (Shavuoth) of the first-fruits of your work." From when do you bring? From Shavuoth until Channukah.