Melachim Alef 18:36

And it came to pass at the time of the offering of the minchah (evening sacrifice), that Eliyahu HaNavi came near, and said, HASHEM Elohei Avraham, Yitzchak and of Yisroel, let it be known this day that Thou art Elohim in Yisroel, and that I am Thy Eved, and that I have done all these things at Thy Davar.