Why does the Torah insert the word "Sei" both by "Kevasim" and by "Izim"?
Rashi (in Bo, Sh'mos, 12:5): We learn from the fact that the Torah writes "ve'Sei Izim" that the term "Seh" also applies to goats.
Targum Yonasan: To preclude the children of Tamei species, and children of a crossbreed of a Tahor species with a Tamei one, respectively.
Why does the Torah write "Sei Kesavim" (plural)?
B'choros, 7a: To teach us that it is only Kasher if its father and mother are both of a Tahor species - either a lamb or a goat. Refer to 14:4:1:1.
?Zos ha?Beheimah asher Tocneilu?. Why does the Torah list the Tahor animals, but the Tamei birds?
Rashi and R. Bachye (on Pasuk #7): Because there are more Tamei species of animals than Tahor ones, and more Tahor species of birds than Tamei ones, and the Torah always lists the minority. 1
For the sake of brevity. R. Bachye: And we learn from here that a Rebbe should teach his Talmidim in a concise manner.
