The hand applies the power of the arm and directs it, so, in many cases where it appears in figurative speech, the idea of “applied power” can be associated with the word “hand.” (Ex 7:4; 13:3; De 2:15; Lu 1:66)

The hands of the priests were filled with sacrifices by Moses at the time of their installation as part of the ceremony symbolically equipping them, ‘filling their hands’ with authority and power for the priesthood.​—Le 8:25-27, 33; see FILL HAND WITH POWER.