What is the connection between this Pasuk ("Kein Ta'aseh le'Shorcha") and "B'chor Banecha Titen Li" (in the previous one) ?
Rashbam: They are all to do with giving the first (Reishis) to Hashem.
Hadar Zekenim: If you give the B'chor ox to Me, the rest will be blessed, just like regarding children.
Bechoros, 26b: Adding to theMItzvah of giving one's B'chor to the Kohen, the Torah is obligating a Yisrael to look after a firstborn calf
What are the connotations of "Shiv'as Yamim Tih'yeh Im Imo"?
Rashi: It is a prohibition against the Kohen offering up a B'chor before the eighth day. 1
Targum Yonasan: For seven days it will nurse from its mother.
Hadar Zekenim: Even though I told you to give it to Me promptly, do not rush within seven days, for it came from a filthy place.
Toras Kohanim (in Emor): It means that, as long as the mother is alive when the B'chor is born, the Bchor is eligible to go on the Mizbe'ach
What are the connotations of "ba'Yom ha'Shemini Titno Li"?
Rashi: What the Pasuk means is that from the eighth day on, the Kohen is permitted to sacrifice it. 1
Seforno: Refer to 22:28:4:2.
Targum Onkelos and Targum Yonasan: Designate it on the eighth day.
Chulin, 81a: Someone who brings a Mechusar Z'man on the Mizbe'ach is not subject to Malkos, since the Torah writes "Titno Li", turning it into an Asei'. 2
And it learns this via a Gezeirah-Shavah "Shemini" "Shemini" (in connection with Korbanos), where the Torah writes in Vayikra 22:27 - "umi'Yom ha'Shemini va'Hal'ah Yeratzeh" (Rashi). Torah Temimah: And we learn that other Korbanos may be brought on the eighth day itself from B'chor.
And we have a principle