A questioner cited this to argue the speaker is the Creator yet says 'the Lord God and his Spirit sent me,' which was used as a Trinitarian challenge.
Scripture spotlight
Isaiah 48:12-16
bible
12 Listen to me, O Jacob, and Israel my called: I am he; I am the first, I also am the last. 13 Yes, my hand has laid the foundation of the earth, and my right hand has spread out the heavens: when I call to them, they stand up together. 14 Assemble yourselves, all you, and hear; who among them has declared these things? He whom Yahweh loves shall perform his pleasure on Babylon, and his arm [shall be on] the Chaldeans. 15 I, even I, have spoken; yes, I have called him; I have brought him, and he shall make his way prosperous. 16 Come you near to me, hear you this; from the beginning I have not spoken in secret; from the time that it was, there am I: and now the Lord Yahweh has sent me, and his Spirit.
Used to argue that Yahweh speaks and then says 'the Lord Yahweh and His Spirit have sent me,' which the Christians presented as evidence of a multi-personal God in the Hebrew Bible.
Cited to show a divine speaker who says 'I am the first and I am the last' also says 'the Lord Yahweh has sent me, and his Spirit,' arguing plurality within Yahweh.