zechariah 11:13 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. - Free Bible Online

      13. Cast it unto the potter--proverbial: Throw it to the temple potter, the most suitable person to whom to cast the despicable sum, plying his trade as he did in the polluted valley (2Ki 23:10) of Hinnom, because it furnished him with the most suitable clay. This same valley, and the potter's shop, were made the scene of symbolic actions by Jeremiah (Jer 18:1-19:15) when prophesying of this very period of Jewish history. Zechariah connects his prophecy here with the older one of Jeremiah: showing the further application of the same divine threat against his unfaithful people in their destruction under Rome, as before in that under Nebuchadnezzar. Hence Mt 27:9, in English Version, and in the oldest authorities, quotes Zechariah's words as Jeremiah's, the latter being the original author from whom Zechariah derived the groundwork of the prophecy. Compare the parallel case of Mr 1:2, 3 in the oldest manuscripts (though not in English Version), quoting Malachi's words as those of "Isaiah," the original source of the prophecy. Compare my Introduction to Zechariah. The "potter" is significant of God's absolute power over the clay framed by His own hands (Isa 45:9; Jer 18:6; Ro 9:20, 21).
      in the house of the Lord--The thirty pieces are thrown down in the temple, as the house of Jehovah, the fit place for the money of Jehovah-Messiah being deposited, in the treasury, and the very place accordingly where Judas "cast them down." The thirty pieces were cast "to the potter," because it was to him they were "appointed by the Lord" ultimately to go, as a worthless price (compare Mt 27:6, 7, 10). For "I took," "I threw," here Matthew has "they took," "they gave them"; because their (the Jews' and Judas') act was all His "appointment" (which Matthew also expresses), and therefore is here attributed to Him (compare Ac 2:23; 4:28). It is curious that some old translators translate, for "to the potter," "to the treasury" (so MAURER), agreeing with Mt 27:6. But English Version agrees better with Hebrew and Mt 27:10.

JFB.