Rashi on Exodus 28:41/רש"י על שמות כ״ח:מ״א

1והלבשת אתם את אהרן AND THOU SHALT PUT THEM ON AARON — i. e. those which are mentioned in connection with Aaron: the breast-plate, the ephod, the Robe, the inner garment of checker-work, the mitre, the girdle and the Plate, and the breeches which are prescribed later for all of them (for all the priest’s and therefore for Aaron also).

2ואת בניו אתו [AND THOU SHALT PUT THEM ON AARON …] AND ON HIS SONS WITH HIM — i. e. put on them those garments which are prescribed for them.

3ומשחת אתם AND THOU SHALT ANOINT THEM — viz., Aaron and his sons, with the oil of anointing.

4ומלאת את ידם AND THOU SHALT CONSECRATE THEM (more lit., fill their hand) — wherever the term “filling the hand” is used it denotes the installation ceremony performed when one enters for the first time into an office, as a sign that he is entitled to it from that day and henceforth. And in the old French language — when a person is appointed to the charge of a matter, the Prince puts into his hand a leathern glove which they call “gant” in old French and by that means he gives him a right to the matter, and they term that transmission of the glove and the office, revestir in old French This is the connection between the literal and the metaphorical meaning of “filling the hand”.