An analysis of the persons mentioned in Isaiah 48:16

קִרְב֧וּ אֵלַ֣י שִׁמְעוּ־זֹ֗את לֹ֤א מֵרֹאשׁ֙ בַּסֵּ֣תֶר דִּבַּ֔רְתִּי מֵעֵ֥ת הֱיֹותָ֖הּ שָׁ֣ם אָ֑נִי וְעַתָּ֗ה אֲדֹנָ֧י יְהוִ֛ה שְׁלָחַ֖נִי וְרוּחֹֽו׃ פ

"Come near to Me, listen to this: From the first I have not spoken in secret, From the time it took place, I was there. And now the Lord GOD has sent Me, and His Spirit."