Reference for Numbers 8:13

וְהַֽעֲמַדְתָּ֙ אֶת־הַלְוִיִּ֔ם לִפְנֵ֥י אַהֲרֹ֖ן וְלִפְנֵ֣י בָנָ֑יו וְהֵנַפְתָּ֥ אֹתָ֛ם תְּנוּפָ֖ה לַֽיהוָֽה׃

And thou shalt set the Levites before Aaron, and before his sons, and offer them for a wave-offering unto the LORD.

BDB

BDB