2 Chronicles 32:30-31

30This same Hezekiah also stopped up the upper outlet of the waters of Gihon and channeled them down to the west side of the City of David. Hezekiah succeeded in everything that he did.

31And so in the matter of the envoys of the rulers of Babylon, who were sent to him to inquire about the wonder that had happened in the land, God left him alone only to test him, in order to know everything that was in his heart.