'Thirty Shekels of Silver' in the Bible

If the ox shall push a manservant or a maidservant; he shall give unto their master thirty shekels of silver, and the ox shall be stoned.

And I said to them, If it seems good to you, give me my payment; and if not, do not give it. So they gave me my payment by weight, thirty shekels of silver.

And the Lord said to me, Put it into the store-house, the price at which I was valued by them. And I took the thirty shekels of silver and put them into the store-house in the house of the Lord.