Halakhah su Levitico 22:21

And so [too,] from the matter of the commandment is that which they also said that one who sacrifices who has a disqualifying thought transgresses a negative commandment; as it is stated (Leviticus 7:18), "it shall not be counted (yichashev) for him (which can also be read as, 'he shall not think about it')." And we learned from the tradition (Zevachim 29b) that included in this warning (negative commandment) is about one who sacrifices, that he not have a disqualifying thought. But nonetheless, it is not considered to be from the tally of the three hundred and sixty-five negative commandments, since it is similar to one of the extensions of another negative commandment, which is calculated in the tally – and that is that which is written in the Order of Emor el HaKohanim, "There shall be no blemish in it" (Leviticus 22:21) – and they, may their memory be blessed, expounded (Berakhot 33b), on account of the negative commandment of one who places a blemish in [sacrifices]; as we shall write with God’s help (Sefer Ha Chinukh 287). And also the content of one who has a disqualifying thought is considered similar to one who places a blemish. And hence they did not consider it in the tally. And in any event, he is not lashed for it, since there is no act [involved] with it, but rather only thought. And the rest of the laws of thoughts: which thought disqualifies, for example the thought of changing a name, the thought of a place and the thought of a time; and in which sacrifice; and which process, for example slaughter, sprinkling, reception, taking; and all of the details of the laws of piggul - and also of notar, which is similar to it - are elucidated in many places in the Order of Kedoshim.

The commandment of the sacrifice being unblemished: That every sacrifice that we sacrifice be perfect from blemishes that come in Scripture and from those that the tradition comes about that they are blemishes for its specie. And that is [the understanding of] what is stated about this (Leviticus 22:21), "unblemished shall it be acceptable." And they said in Sifra, Emor, Section 7:9, "'Unblemished shall it be' - is a positive commandment." And they brought a proof (Menachot 87a) that the libations and flours and oils [also] be completely perfect from degeneration from that which is written (Numbers 28:31), "they shall be unblemished, and their libations."

That we not place a blemish upon consecrated animals: - That we not place a blemish upon consecrated animals; meaning to say that we not make any wound or any fracture upon a beast that is consecrated for the altar that disqualifies it as an offering - as it is stated (Leviticus 22:21), "and no blemish shall be upon it." And they, may their memory be blessed, said (Menachot 56b), "Read it as 'shall not be made in it.'" And the language of Sifra, Emor, Section 7:9 is, "'No blemish shall be upon it' - do not place a blemish upon it."