וַעֲלִיתֶ֣ם אַחֲרָ֗יו וּבָא֙ וְיָשַׁ֣ב עַל־כִּסְאִ֔י וְה֥וּא יִמְלֹ֖ךְ תַּחְתָּ֑י וְאֹת֤וֹ צִוִּ֙יתִי֙ לִֽהְי֣וֹת נָגִ֔יד עַל־יִשְׂרָאֵ֖ל וְעַל־יְהוּדָֽה׃
Then ye shall come up after him, and he shall come and sit upon my throne; for he shall be king in my stead; and I have appointed him to be prince over Israel and over Judah.’
Ralbag on I Kings
and he shall come and sit upon my throne: To publicize to everyone that he is king, in order to deflect controversy from Solomon.