These two sentences mean the same thing and are used together to emphasize how much Hezekiah showed the men. (See: [[rc://en/ta/man/jit/figs-parallelism]])
This is a generalization, as Hezekiah showed them many things, but not necessarily everything in the palace. Alternate translation: "almost everything in my house" (See: [[rc://en/ta/man/jit/figs-hyperbole]])
This can be expressed positively. Alternate translation: "I showed them all the valuable things in my palace" (See: [[rc://en/ta/man/jit/figs-doublenegatives]])