The phrase "Jesus Christ is Lord" can be found in Phil 2v10,11, which is taken from Isaiah 45v23: "I have sworn by myself, the word is gone out of my mouth in righteousness, and shall not return, That unto me every knee shall bow, every tongue shall swear." In Isaiah 45v23 it is Yahweh speaking and the Greek word "kurios" is used to translate "Lord" in Phil 2v11, the same Greek word is used in this passage in Isaiah to translate the Hebrew 'Yahweh' in the Septuagint (which the early Church writers, under the divine inspiration of the Holy Spirit, used to take OT prophetic Scriptures and use them in the NT writings), so the phrase 'Jesus Christ is Lord' teaches that 'Jesus Christ is Yahweh,' the Greater Creator and Sustainer of all things, the One Who is our Saviour. Col 1v14-18.