# Is this house, which carries my name, a den of bandits in your eyes?

"You act as though you think this house, which is called by my name, should be a place where bandits can go to hide!"

# this house, which carries my name

This has a similar meaning to "this house that is called by my name" in the previous verse.

# bandits

violent people who steal and destroy

# But behold, I have seen it

"But I certainly have seen what you are doing"

# this is Yahweh's declaration

 "this is what I, Yahweh, have declared". See how you translated this in Jeremiah 1:8.