en_tn/1ki/09/05.md

the throne of your kingdom

Here "throne" refers to his reign. AT: "your dynasty" or "your reign" (See: rc://en/ta/man/translate/figs-metonymy)

will never fail to be on the throne of Israel

The action of ruling a kingdom is spoken of as if it were a person sitting on a throne. This can be expressed positively. AT: "will always rule over Israel" (See: rc://en/ta/man/translate/figs-metonymy and rc://en/ta/man/translate/figs-litotes)