The thirty pieces of silver would be used to buy the Potter's Field.
OT Prophecy NT Fulfillment
Zechariah 11:13b
And the LORD said unto me, Cast it unto the potter: a goodly price that I was prised at of them. And I took the thirty pieces of silver, and cast them to the potter in the house of the LORD.
Matthew 27:6–7
[6] And the chief priests took the silver pieces, and said, It is not lawful for to put them into the treasury, because it is the price of blood.
[7] And they took counsel, and bought with them the potter's field, to bury strangers in.
Tanakh – Neviim – Zechariah 11:13b
And HaShem said unto me: 'Cast it into the treasury, the goodly price that I was prized at of them.' And I took the thirty pieces of silver, and cast them into the treasury, in the house of HaShem.
Hebrew OT – Zechariah 11:13b
[11:13] וַיֹּאמֶר יְהוָה אֵלַי
הַשְׁלִיךְ אֹתוֹ אֶל־הַיּוֹצֵר
אֶדֶר הַיְקָר אֲשֶׁר יָקַרְתִּי מֵהֶם
וָאֶקַּח שְׁלֹשִׁים הַכֶּסֶף
וָאַשְׁלִיךְ אֹתוֹ בֵּית־יְהוָה אֶל־הַיּוֹצֵר