Cross reference
Leviticus 27:4
4 If it is a female, then your valuation shall be thirty shekels.
Zechariah 11:12-13
12 I said to them, "If you think it best, give me my wages; and if not, keep them." So they weighed for my wages thirty pieces of silver.
13 Yahweh said to me, "Throw it to the potter, the handsome price that I was valued at by them!" I took the thirty pieces of silver, and threw them to the potter, in the house of Yahweh.
Matthew 26:15
15 and said, "What are you willing to give me, that I should deliver him to you?" They weighed out for him thirty pieces of silver.
Matthew 27:9-10
9 Then that which was spoken through Jeremiah the prophet was fulfilled, saying, "They took the thirty pieces of silver, The price of him upon whom a price had been set, Whom some of the children of Israel priced,
10 And they gave them for the potter's field, As the Lord commanded me."