“Rabbi Abba and Rabbi Ḥiyya were walking along the way. Rabbi Ḥiyya said, ‘It is written: And you shall count you from the morrow of the sabbath, from the day you bring the elevation sheaf, [seven complete weeks shall they be] (Leviticus 23:15). What does this indicate?’
He replied, ‘The Companions have established this but come and see: When the people of Israel were in Egypt, they were under alien domination and were gripped by impurity, like a woman sitting in days of impurity. After they were circumcised, they entered the holy portion called Covenant. Once they were joined to this, their impurity ceased, as when a woman’s blood of impurity ceases. After [the blood] ceases, what is written? [When she becomes purified from her flux,] she shall count for herself seven days [and after shall be clean] (Leviticus 15:28). Similarly here, once they entered the holy portion, their impurity ceased, and the blessed Holy One said, ‘From now on, a counting for purity.’ You shall count for yourselves—yourselves, precisely, as said: She shall count for herself, for her own self. Here, too, for yourselves—for your own selves. Why? To be purified by supernal holy waters, and afterward to come join the King and receive His Torah.
It is written: She shall count for herself seven days (Leviticus 15:28); here, too, seven weeks. Why seven weeks? To attain being purified by waters of the flowing, gushing river, called ‘living waters’ [Binah]. From that river issue seven weeks—so seven weeks surely, to attain it.
‘Just as a woman’s purity takes effect at night [after immersing herself in a miqveh], to join conjugally with her husband, so it is written When the dew would descend on the camp at night (Numbers 11:9). It is written on the camp, and not, When the dew would descend at night. And when did this dew descend? When Israel approached Mount Sinai—then that dew descended perfectly and they were purified, their filth ceasing, and they joined the King and received the Torah and Assembly of Israel, as we have established. At that time surely, All the streams flow into the Sea (Ecclesiastes 1:7)—to be purified and washed—and all are sanctified and joined with the Holy King.’
‘Come and see: if anyone does not reckon this count—those seven weeks—to attain this purity, he is not called ‘pure’ and is not in the category of pure, nor is he worthy of having a share in Torah. But if one arrives pure on this day and has not lost count, when he reaches this night he should delve into Torah and join her, preserving the supernal purity that comes upon him on that night, purifying him” (Zohar 3:97a–b, cf. BT Menaḥot 65b–66a).
“Certainly, in your prayer and in your recital of the Shema, the Shekhinah is renewed before the blessed Holy One and this is why it is said: [Until the morrow of the seventh sabbath you shall count fifty days] and you shall bring forward a new grain offering to YHWH (Leviticus 23:16). By the prayers which are instead of the sacrifices. But in which sacrifices, [namely] prayers, is She renewed? In your Festival of Weeks (Numbers 28:26), namely Shavuoth, which is when Torah was given, and which is called fifty days of the counting of the Omer, and which comprises seven weeks, from the side of the one about whom it is said: Seven times daily I praise You (Psalms 119:164), which is Malkhut, who is כַּלָה (kalah), bride, and is composed of the seven sefirot and is composed of Binah; and it spreads out in five sefirot of fifty.
Yesod [which is called] כֹּל (Kol), All (1 Chronicles 29:11) is composed of these fifty, [namely Ḥesed, Gevurah, Tif’eret, Netsaḥ, and Hod, each of which is composed of ten. Malkhut is called כַּלָה (kalah), bride, [the letters of which can also be read]: כֹּל ה (kol he) [numerically equivalent to fifty and five, namely] five [sefirot] composed of fifty. Each of them is enclosed within the fifty. Ḥokhmah, which is upper י (yod) is enclosed within the fifty, for ה״ (five) times י״ (ten). ה (He) is Binah and י (yod) is Ḥokhmah, [and there are י (yod) and ה (he) in Ḥokhmah, which when multiplied by each other, make fifty, and there are י (yod) and ה (he) in Binah; and when] י״ (ten) is [multiplied] by ה״ (five), the result is fifty, and this is the sum of כֹּל (Kol), All, and the numerical value of יָם (Yam), Sea [for Binah is called Sea, whose sum is fifty]. And the reference is to the Sea of Torah [where from Binah, which is called ‘Sea,’ emerges Torah, which is Ze’eir Anpin]. Its origin is Keter, which is infinite. The remaining sefirot are named after it: Seven Seas. And Malkhut [is] the יָם סוּף (Yam Suf), Sea of Reeds, the סוֹף דְּכָל יָמִים (sof de-khal yamim), end of all seas.
And because [each one of the] the seven weeks is fifty: And their grain offering… three-tenths for the single bull, two-tenths for the single ram (Numbers 28:28), making altogether five [tenths] which are five times ten. And their grain offering mixed with oil, three-tenths for the single bull, two-tenths for the single ram. A tenth for every single lamb of the seven lambs (Numbers 29:9). Seven lambs—seven whole Sabbaths shall they be (Leviticus 23:15) and each one has six days [sefirot] with it” (Zohar 3:255a–b, Ra’aya Meheimna Pineḥas).