Bearing in mind that the Torah - later in Pasuk 20 - specifically permits eating Basar Ta'avah (meat of Chulin) without bringing the Emurim on the Mizbe'ach, what is the Pasuk referring to here?
Rashi: It is referring to Pesulei ha'Mukdashin - Kodshim that obtained a permanent blemish and that have been redeemed. 1
Rashbam: It is nevertheless referring to eating Chulin outside Yerushalayim.
Rashi: Which the Torah needs to teach us because because it comes from Kodshim, about which the Torah wrote - in Vayikra 7:19 - "ve'ha'Basar asher Yiga be'Chol Tamei Lo Ye'achel". See also Torah Temimah, citing the Sifri and note 47.
Why is "Rak" coming to preclude?
Rashi It precludes Kodshim that obtained a temporary blemish from being redeemed and eaten like Chulin. 1
And working with them.
What are the words "Tizbach Ve'achalta Basar" coming to teach us?
Rashi: To extrapolate that the shearings and the milk of Pesulei ha'Mukdashin are forbidden.
Temurah, 31a #1: "Tizbach" (Shecht) but do not shear; "Ve'achalta" (you will eat), but not your dog 1 ; "Basar", but not milk. Consquently, if the animal became a T'reifah, it may not be redeemed. 2
Temurah 31a #2: "Tizbach Ve'achalta" teaches that you may benefit (from Pesulei ha'Mukdashim) only after Shechitah. This Tana permits redeeming Kodshim to feed them to dogs. 3
Bechoros, 32a #2: To teach us that the Pasuk is discussing Ma'aser Beheimah - which may not be sold whilst the animal is alive 4 and is subject to use only after it has been Shechted.
Why does the Torah add "ke'Virkas Hashem Elokecha ... "?
Sifri: To permit the shearings and the milk of Pesulei ha'Mukdshin after they have been Shechted.
Why does the Torah compare Pesulei ha'Mukdasin to "Tzvi ve'Ayal"?
Rashi #1: To teach us that Pesulei ha'Mukdashnin are Chulin, like a deer and a gazelle. 1
Rashi #2: To teach us that, like Tzvi ve'Ayal, 2 Pesulei ha'Mukdashin are exempt from Matanos (Zero'a Lechayayim ve'Keivah - the right foreleg, the jaw and the stomach).
Makos, 22a: From the fact that the Torah compares Pesulei ha'Mukdashin to two animals, 3 we learn that if someone leads an ox of Pesulei ha'Mukdashin that is pulling a wagon, he is subject to Malkos, 4 and that if he mates an ox of Pesulei ha'Mukdashin with aanother animal, he is subject to two sets of Malkos.
Bechoros, 15a: To teach us that, like Tzvi ve'Ayal, Pesulei ha'Mukdashin are exempt from B?chorah and Matanos. 5
Chayos which are not subject to Kodshei Mizbe'ach.
Chayos which are not subject to the Din of Zero'a Lechayayim ve'Keivah.
See Torah Temimah, note 51.
As if it had been drawn by two different animals.
Bechoros, Ibid.: But not from 'Oso ve'es B'no', since the Torah writes "Rak". See Torah Temimah, note 51.
