Please explain why you would think that Peter in the verses from 2 Peter 1& 2 is referring to animal blood.
You mean before or after you answer my questions about your previously posted opinions concerning the "they" and "them" of 2 Peter being saved dogs/sows/false prophets (or not)? I mean you quoted my questions, but didn't even bother to answer them. But here they are again:
Do you think mere knowledge of who Jesus is and what He's done (His sacrifice) saves? Or is actual repentance and believing in (obeying) required?
It's been noticed by many (not just me) that you don't actually address tough questions that pose significant challenges to your presented understandings of various passages. So I really don't expect an answer from you to these questions, but maybe you will strengthen your weak case by providing an answer.
I'll answer your question anyway, though. This letter (His second to them) was written by Peter (a Jew) as a reminder of his first, to the Jews who'd been practicing animal sacrifices their whole lives who'd been recently dispersed out of Jerusalem. In them, he's saying
the precious blood of Christ is like that of an unblemished and spotless lamb"
2 Peter 3:1-2Lexham English Bible (LEB) 3 Dear friends, this is already the second letter I am writing to you, in both of which I am attempting to stir up your sincere mind by a reminder, 2 to remember the words proclaimed beforehand by the holy prophets and the commandment of the Lord and Savior through your apostles,
1 Peter 1:1-2 Peter, an apostle of Jesus Christ, to the chosen who are residing temporarily in the dispersion in Pontus, Galatia, Cappadocia, Asia, and Bithynia, according to the foreknowledge of God the Father, by the sanctification of the Spirit, for obedience and for sprinkling with the blood of Jesus Christ. May grace and peace be multiplied to you.
Throughout the letters (not just here) Peter is making references to their former animal blood sacrifices, cleansings, priesthoods, etc. Yet shows these new Christians how Jesus (and the Holy Spirit) IS all these things now (only now perfectly so).
14-15, 18-19, 22-24 And you yourselves, as living stones, are being built up as a spiritual house for a holy priesthood, to offer up spiritual sacrifices acceptable to God through Jesus Christ. As obedient children, do not be conformed to the former desires you used to conform to in your ignorance, but as the one who called you is holy, you yourselves be holy in all your conduct, because you know that you were redeemed from your futile way of life inherited from your ancestors not with perishable things like silver or gold, but with the precious blood of Christ, like that of an unblemished and spotless lamb Having purified your souls by your obedience to the truth for sincere brotherly love, love one another fervently from the heart, because you have been born again, not from perishable seed but imperishable, through the living and enduring word of God. For “all flesh is like grass, and all its glory like the flower of the grass.