'Shekel' in the Bible

"If anyone commits a trespass, and sins unwittingly, in the holy things of Yahweh; then he shall bring his trespass offering to Yahweh, a ram without blemish from the flock, according to your estimation in silver by shekels, after the shekel of the sanctuary, for a trespass offering.

Your valuation shall be of a male from twenty years old even to sixty years old, even your valuation shall be fifty shekels of silver, after the shekel of the sanctuary.

All your valuations shall be according to the shekel of the sanctuary: twenty gerahs to the shekel.