This would be an act of unspeakable arrogance if Elijah were not so wholly hidden in God. From what we believe about the true prophetic voice Elijah was not even the one who was speaking, but God who possessed his life and spoke through him. The Father and His servant could work together in perfect unity.
1 Kings 17:1 ESV Now Elijah the Tishbite, of Tishbe in Gilead, said to Ahab, "As the LORD, the God of Israel, lives, before whom I stand, there shall be neither dew nor rain these years, except by my word."
We have "so-called" prophets running around the world speaking a "thus says the Lord" all over the place. Some of them might be true and of the Lord but many are "want-a-bes" desiring to be recognized as a Prophet of the Most High. The true Prophets of the last days will be an instrument in the hands of God and instead of predicting events they will speak forth events. They will declare God's judgment upon a land and speak from the throne room of heaven the very voice of God and cause the earth to shake, the seas to roar, and the mountains to tumble.
1 Corinthians 6:17 ESV But he who is joined to the Lord becomes one spirit with him.
There is an incredible union between God the Father and the believer through the Lord Jesus Christ. That intimate union between the Father and the one whom He has called to stand as a Prophet will be as one voice.
It is to this place of intimate union with Him that the Lord is bringing those who are willing in this present hour. The shaping of such vessels is not accomplished in one day. Elijah was not afraid that he might be accused of testing God or of attempting to steal His glory. He spoke boldly, for he knew that the two halves of his statement are perfectly related, “The Lord God of Israel”, “before whom I stand”.