And he {f} slew it; and Moses took of the blood of it, and put it upon the tip of Aaron's right ear, and upon the thumb of his right hand, and upon the great toe of his right foot.

(f) Moses did this because the priests were not yet established in their office.Leviticus 8:23 Parallel Commentaries

The Copies of Things in the Heavens
'And the Lord spake unto Moses, saying, 2. On the first day of the first month shalt thou set up the tabernacle of the tent of the congregation. 3. And thou shalt put therein the ark of the testimony, and cover the ark with the vail. 4. And thou shalt bring in the table, and set in order the things that are to be set in order upon it; and thou shalt bring in the candlestick, and light the lamps thereof. 5. And thou shalt set the altar of gold for the incense before the ark of the testimony, and put …
Alexander Maclaren—Expositions of Holy Scripture

Appendix ii. Philo of Alexandria and Rabbinic Theology.
(Ad. vol. i. p. 42, note 4.) In comparing the allegorical Canons of Philo with those of Jewish traditionalism, we think first of all of the seven exegetical canons which are ascribed to Hillel. These bear chiefly the character of logical deductions, and as such were largely applied in the Halakhah. These seven canons were next expanded by R. Ishmael (in the first century) into thirteen, by the analysis of one of them (the 5th) into six, and the addition of this sound exegetical rule, that where two …
Alfred Edersheim—The Life and Times of Jesus the Messiah