7. You may say that yet, it is written: "And let birds fly above the earth" (Beresheet 1:20), from which sacrifices are offered and even burnt offerings, as written: "And if the burnt sacrifice for his sacrifice to Hashem be of birds" (Vayikra 1:14). THUS, "CATTLE" IS NOT ACCURATE, AS YOU EXPLAINED. HE ANSWERS: Come and behold. Of all the birds, only turtledoves and young pigeons are offered. There is a secret to it, which is that what is fit in the one is unfit in the other. THE COLOR RED IS SUITABLE FOR TURTLEDOVES, BUT NOT FOR YOUNG PIGEONS. THE REASON IS THAT THE YOUNG PIGEON is the right and THE TURTLEDOVE is the left. HENCE, RED IS SUITABLE FOR IT, WHICH ALLUDES TO THE LEFT COLUMN, and all is one.
8. "And let birds fly above the earth" (Beresheet 1:20). We explained this to be the secret of the Chariot, AS THEY ARE THE ANGELS MICHAEL AND GABRIEL, WHO ARE CALLED 'BIRDS.' The Spirit of Holiness, WHICH IS MALCHUT, arises through them TO MATE WITH ZEIR ANPIN. They are two, one on the right, the other on the left. "Bird" is on the right, which is Michael, and "fly" is to the left, which is Gabriel. Thus, there is one to the right and one to the left.
9. This is why these two are sacrificed, TURTLEDOVES AND YOUNG PIGEONS, THE SECRET OF MICHAEL AND GABRIEL, in order to raise the Holy Spirit, MALCHUT, TO ZEIR ANPIN. The left OF ZEIR ANPIN adorns and arms below the left side OF MALCHUT, and the right does so to the right, so that a woman joins her husband, NAMELY, MALCHUT JOINS ZEIR ANPIN, to become one. Everything ascends to be attached together above and below. The Holy One, blessed be He, rises, and He alone is exalted.
10. In ancient books, IT IS SAID THAT the poor WHO SACRIFICE TURTLEDOVES AND YOUNG PIGEONS give no portion to sustain THE WORLDS, but rather to bring unity above. Yet everything above and below is properly attached to its own side, as we already explained.