Exodus 30:16

And thou shall take the atonement money of the children of
Israel
The half shekel, the ransom of their souls:

and shall appoint it for the service of the tabernacle of the
congregation;
for the building of the tabernacle, for the repairs of it, and for the sacrifices offered in it; particularly we find that this first collection this way was appropriated to the silver sockets of the sanctuary, and the vail, for the silver hooks, and for the pillars, ( Exodus 38:27 Exodus 38:28 ) :

that it may be a memorial unto the children of Israel before the
Lord, to make an atonement for your souls;
to put them in mind that they were sinners, that their lives were forfeited, that a ransom price was given and accepted of God, that hereby atonement, in a typical sense, was made for them; and this was before the Lord, as a token of their gratitude to him, and of their acknowledgment of the favour.