אChiddush
Teshuvah precedes the Geulah — and the exile’s avodah completes the birurim, ending the admixture of good and evil
אגרות קודש כרך א, אגרת קלח, ע׳ רנ״א
Our Sages taught (Shekalim 1:1): “On the first of Adar they proclaim concerning the shekalim and concerning the kilayim [the forbidden mixtures].” And the connection of these two, in a person’s service of his Maker in these days of ikvesa d’Meshicha, may be explained. For our Sages said (Rosh Hashanah 11a): “In Nissan they were redeemed, and in Nissan they are destined to be redeemed” — and even according to the view that they will be redeemed in Tishrei, Nissan is the month of Geulah, for in it was the Exodus, the first complete redemption.
And just as at the redemption from Egypt our Sages sought the merits by which our fathers were redeemed, all the more so afterward: since “because of our sins we were exiled from our land,” there must first be the mending of the flaw — the removal of the cause of exile — and only then will the Geulah come. As it is said (Sanhedrin 97b): R’ Eliezer says, if Israel do teshuvah they are redeemed…; R’ Yehoshua says, [even] if they do not do teshuvah, [the Holy One] sets over them a king whose decrees are as harsh as Haman’s, and Israel do teshuvah — so that in every view, teshuvah precedes the Geulah.
And in this exile, the last exile, beyond the need to mend the particular flaw through which it came — of which our Sages said (Yoma 9b), “the Temple was destroyed because of baseless hatred” — through the avodah in the present time of exile there will be the completion of the birurim, as is hinted (Sanhedrin 98a): “the son of David comes only in a generation that is entirely innocent or entirely guilty” — that there be no further admixture of good and evil, whose beginning was the sin of the Tree of Knowledge of good and evil.
This is the hint of the Mishnah at the opening of Shekalim: on the first of Adar — for the month of Adar is the preparation for the month of Geulah, Nissan — the Beis Din proclaims the whole avodah of this month, which is the preparation for the Geulah, in two matters: the shekalim, by which all Israel are made equal (“the rich shall not give more and the poor not less”) and are joined together as one full stature to bring an offering to Hashem — mending the particular cause of this exile, baseless hatred; and the kilayim — that the kelipah and the sitra achra, the very opposite of holiness, the ultimate forbidden mixture of good and evil, must be uprooted. And through this avodah, “when Adar enters, we increase in joy” is fulfilled.
Sources
Shekalim 1:1 · Rosh Hashanah 11a · Sanhedrin 97b (teshuvah precedes the Geulah) · Yoma 9b (baseless hatred) · Sanhedrin 98a (“a generation entirely innocent or guilty”) · Taanis 29a (“when Adar enters…”) · reprinted in part in Likkutei Sichos vol. 11, p. 308.