Le Lévitique 8:23 Midrash : Sifra

וַיִּשְׁחָ֓ט ׀ וַיִּקַּ֤ח מֹשֶׁה֙ מִדָּמ֔וֹ וַיִּתֵּ֛ן עַל־תְּנ֥וּךְ אֹֽזֶן־אַהֲרֹ֖ן הַיְמָנִ֑ית וְעַל־בֹּ֤הֶן יָדוֹ֙ הַיְמָנִ֔ית וְעַל־בֹּ֥הֶן רַגְל֖וֹ הַיְמָנִֽית׃

L’ayant immolé, Moïse prit de son sang, qu’il appliqua sur le lobe de l’oreille droite d’Aaron, sur le pouce de sa main droite et sur l’orteil de son pied droit;

Sifra

21) (Vayikra 8:23): "And he slaughtered, and Moses took of its blood": The three bloods mentioned in this section are not similar one to the other (see Vayikra 8:33 below). The first requires six applications; the second, two; and the third, thirteen. This is the intent of "And he slaughtered and he took its (particular) blood." "and he placed it on the tnuch of Aaron's right ear": This (tnuch) is the middle wall. "and upon the thumb of his right hand": This is the middle joint.