Deuteronomy 33:10
They shall teach Jacob thy judgments, and Israel thy law: they shall put incense before thee, and whole burnt sacrifice upon thine altar. They shall teach Jacob thy judgments, and Israel thy law: they shall put incense before thee, and whole burnt sacrifice upon thine altar.
The tribe of Levi was appointed to sacred service in the sanctuary. That office included teaching Jacob the divine judgments and Israel the law, and offering incense and whole burnt sacrifice upon the altar. Levi had rested under a curse, but that curse was changed into a blessing. The change came because the Levites remained loyal to Jehovah when the other tribes apostatized.