'It is I' in the Bible

Yet it is not Assyria’s intention [to do My will],Nor does it plan so in its heart,But instead it is its purpose to destroyAnd to cut off many nations.

“I will give you the treasures of darkness [the hoarded treasures]And the hidden riches of secret places,So that you may know that it is I,The Lord, the God of Israel, who calls you (Cyrus the Great) by your name.

Who is this who comes from Edom,With crimson-stained garments from Bozrah [in Edom],This One (the Messiah) who is majestic in His apparel,Marching in the greatness of His might?“It is I, [the One] who speaks in righteousness [proclaiming vindication], mighty to save.”