137. Rabbi Yehuda asked Rabbi Aba: It says, "Seven days shall there be no leaven found in your houses" (Shemot 12:19), and there is joy all those seven. Why is no complete Hallel (Prayer of Thanksgiving) recited throughout the seven days OF PESACH as in Sukkot, where we daily recite Hallel with complete joy?
138. He said to him, Well asked. But it is known that here, ON PESACH, Yisrael are not bonded as wholly as they were later, because on that FIRST night when the union OF MALE AND FEMALE is present and overall joy, and Yisrael are bonded with that joy, we bring about perfection and the Hallel is complete. But later, THROUGHOUT THE DAYS OF PESACH, even though they are all present, ALL SEVEN GRADES, CHESED, GVURAH, TIFERET, NETZACH, HOD, YESOD AND MALCHUT THAT SHINE IN THE SEVEN DAYS OF PESACH, Yisrael have not yet connected to them, nor uncovered the corona so the holy imprint will be revealed in them. Nor did they receive the Torah or enter those GRADES, CHESED, GVURAH, TIFERET, NETZACH, HOD, YESOD AND MALCHUT, as they did later. For that reason on Sukkot there is overall perfection and overall joy IS IN IT to the utmost. But here ON PESACH they have not yet attained, and there was not so much perfection in them. Even though all seven are present, CHESED, GVURAH, TIFERET, NETZACH, HOD, YESOD AND MALCHUT OF ZEIR ANPIN DURING THE SEVEN DAYS OF PESACH, they are not revealed, and Yisrael were not well connected with them yet, UNTIL AFTER THE GIVING OF THE TORAH.
139. Therefore there is overall joy and the Hallel is recited in full that FIRST night OF PESACH, because of that portion Yisrael are attached to. The reason is that union is there that night, and all the bond OF ALL THE GRADES is present from the side of union, FROM THE ASPECT OF AWAKENING ABOVE, but not from the side of Yisrael. When the union OF ZEIR ANPIN is in her, IN MALCHUT, the two grades CHOCHMAH AND BINAH were situated over her AS WELL. When these are present, the whole body, THE WHOLE STATURE OF ZEIR ANPIN, is with them. Then everything is perfected and joyous, and the Hallel is recited in full, for then the moon, MALCHUT, is adorned with everything. But this is not so after THE FIRST NIGHT, since every day OF THE SEVEN DAYS GRADES, CHESED, GVURAH, TIFERET, NETZACH, HOD, YESOD AND MALCHUT, is there, but Yisrael have not yet attained them. Thus the Hallel is not complete as in other times.
174. Ra'aya Meheimna (the Faithful Shepherd). "And you shall count for yourselves from the morrow after the Shabbat..." (Vayikra 23:15). We are commanded to perform the counting of the Omer, which we already explained. This is a secret, for Yisrael, even though they were purified so as to perform the Pascal sacrifice and came out of their defilement, were not yet properly whole and pure. Hence the Hallel is not recited in full as in the days of Pesach, since they are not yet properly complete.