וְשַׂמְתָּ֣ הַכֹּ֔ל עַ֚ל כַּפֵּ֣י אַהֲרֹ֔ן וְעַ֖ל כַּפֵּ֣י בָנָ֑יו וְהֵנַפְתָּ֥ אֹתָ֛ם תְּנוּפָ֖ה לִפְנֵ֥י יְהוָֽה׃
And thou shalt put the whole upon the hands of Aaron, and upon the hands of his sons; and shalt wave them for a wave-offering before the LORD.
Read kabbalistic (mystical) interpretation of Exodus 29:24: and classical mystical sources.