Here "hands" represents the whole person. Alternate translation: "gave it all to Aaron and his sons" (See: [[rc://en/ta/man/translate/figs-synecdoche]])
It is implied that Aaron and his sons presented the offering. The full meaning of this statement can be made clear. Alternate translation: "they waved them before Yahweh as a wave offering" (See: [[rc://en/ta/man/translate/figs-explicit]])