Midrash su Deuteronomio 33:10

(Fol. 26) We are taught in a Baraitha: "It never happened that a man has repeatedly offered incense." What is the reason? R. Chanina said: "Because the offering of the incense enriches." "Whence do we deduce this?" asked R. Papa of Abaye. "Shall we assume this, because it is written (Deu. 33, 10) They shall put incense before Thee, and immediately after this. Bless, O Lord, his substance? Then it is not due to incense alone, since it is also written, and who burnt sacrifi upon Thy altar." He answered him: "A burnt-offering is frequent, but incense is not frequent."

Raba said: "You will not find a young scholar who decides questions in Law, yet is not of the tribe of Levi or Isaachar." Levi, concerning whom it is written (Ib.) They {the tribe of Levi) shall teach thy ordinances unto Jacob; and Issachar, concerning whom it is written (I Chr. 12, 32) And of the children of Issachar, those who had understanding of the times. But why not the tribe of Juda also, concerning whom it is written (Ps. 60, 9) Juda is my lawgiver? We refer to a scholar whose final decision should agree with the adopted practice [this belongs only to the descendants of Levi and Issachar].

R. Abahu said in the name of R. Simeon the son of Lakish: When Aaron saw that the angel was about to overpower him, he placed the censer before his countenance, as it is said: They shall put incense before Thee, and whole burnt-offering upon Thine altar (Deut. 33:10). This reveals how beloved incense is. R. Isaac the son of Eliezer declared: You know that after he constructed the Tabernacle and all its implements, he slaughtered the sacrifices, and arranged them on the altar, he set the table, made the menorah, and did everything that had to be done, but the Shekhinah still had not descended. Only when the incense was offered did it descend. You know this for it is written: Awake, O north wind, and come, thou south; blow upon my garden that the spice thereof may flow out (Song 4:16). The Holy One, blessed be He, said: You shall be forgiven in this world because of the incense, but in the world-to-come, I will offer unto Thee burnt-offerings of fatlings, with the smoke of rams; I will offer bullocks with goats. Selah (Ps. 66:15).