Zechariah 11.12-13
Septuagint

kai esthsan ton misqon mou triakonta argurouV.  kai eipe kurioV proV me, kaqeV autouV eiV to cwneuthrion, kai skeyomai ei dokimon estin, on tropon edokimasqhn uper autwn, kai elabon touV triakonta argurouV, kai enebalon autouV eiV ton oikon kuriou eiV to cwneuthrion

New Testament - Matthew 27.9-10

kai elabon ta triakonta arguria, thn timhn tou tetimhmenou on etimhsanto apo uiwn Israhl, kai edwkan auta eiV ton agron tou keramenwV, kaqa sunetaxen moi kurioV

Septuagint

And they weighed for my price thirty pieces of silver. And the Lord said to me, Drop them into the furnace, and I will see if it is good metal, as I was proved for their sakes.  And I took the thirty pieces of silver, and cast them into the furnace in the house of the Lord

New Testament

And they took the thirty pieces of silver, the price of him that was priced, whom certain of the children of Israel did price; and they gave them for the potter’s field, as the Lord appointed me

Masoretic Text

So they weighed for my hire thirty pieces of silver.  And Jehovah said unto me, Cast it unto the potter, the goodly price that I was prized at by them.  And I took the thirty pieces of silver, and cast them unto the potter, in the house of Jehovah

Comments:  Clearly, a loose quotation.  The NT, LXX and the MT agree to an extent - the thirty pieces of silver are mentioned in all three.  The MT includes a reference to a “potter,” (absent from the LXX) but no mention of the “potter’s field.”  There is fair agreement between the NT and the MT in the phrases “the price of him that was priced” and “the goodly price that I was prized at by them.”

Another interesting variation can be found in Lamsa’s translation from the Peshitta of the passage from Zechariah:  “So they weighed for my wages thirty pieces of silver.  And the LORD said to me, Cast it into the treasury; a 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 the LORD.”

It is interesting that Matthew ascribes this quotation to Jeremiah, not Zechariah.  It is unlikely that Jeremiah is actually meant, though Jeremiah 18.1-3 and 32.6-15 do refer to a potter and to the purchase of a field in Anathoth.  (One miniscule (22) and a marginal reading in Harkel’s Syriac version replace Jeremiah’s name with that of Zechariah here.  A few sources replace Jeremiah with Ihsaiou , while others omit the prophet’s name altogether.)