Isaiah 39:3

Then came Isaiah the prophet unto king Hezekiah, and said unto him, What said these men? and from whence came they unto thee? And Hezekiah said, They are come from a far country unto me, even from Babylon.

Cross-reference

In 2 Kings 20:14, the same conversation is recorded — Isaiah asks Hezekiah about the envoys from Babylon.

In 2 Kings 20:15, Hezekiah shows Isaiah all his treasures — the parallel account of this event.