Positive commandment · Mitzvat Aseh #115 of 613
Appraisal of a beast, such that one give according to what the priest appraises
להיות מעריך בהמה טמאה נותן דמיה
The verse · Vayikra 27:11
וְאִם כׇּל־בְּהֵמָה טְמֵאָה אֲשֶׁר לֹא־יַקְרִיבוּ מִמֶּנָּה קׇרְבָּן לַה׳ וְהֶעֱמִיד אֶת־הַבְּהֵמָה לִפְנֵי הַכֹּהֵן
“And if it be any unclean beast, of which they do not offer a sacrifice to the Lord, then he shall present the beast before the priest:”
The Rambam’s words
For a person who makes an endowment valuation concerning a non-kosher animal to give [the required amount of] money, as [Leviticus 27:11] states: "And he shall cause the animal to stand...."
להיות מעריך בהמה טמאה נותן דמיה, שנאמר: "וְהֶעֱמִיד אֶת הַבְּהֵמָה" (ויקרא כז, יא).
Why · Sefer HaChinuch #353
Appraisal of a beast, such that one give according to what the priest appraises
“It is from the roots of the commandment [that it is] since a person only belongs to the higher [realm] through speech, and this is the entire esteemed part in him.”
Who & when
“And this commandment is practiced by males and females at the time of the [Temple].”
Where in the Mishneh Torah
Hilchot Appraisals and Devoted Property הלכות ערכים וחרמין