Verses with the word chaldean in the Old Testament (2 verses):

Ezra 5:12
But after that our fathers had provoked the God of heaven unto wrath, he gave them into the hand of Nebuchadnezzar the king of Babylon, the Chaldean, who destroyed this house, and carried the people away into Babylon.

Daniel 2:10
The Chaldeans answered before the king, and said, There is not a man upon the earth that can shew the king's matter: therefore there is no king, lord, nor ruler, that asked such things at any magician, or astrologer, or Chaldean.