The central passage to the name Jehovah is found in Exodus 6.Then the LORD said unto Moses, Now shalt thou see what I will do to Pharaoh: for with a strong hand shall he let them go, and with a strong hand shall he drive them out of his land. And God spake unto Moses, and said unto him, I am the LORD: And I appeared unto Abraham, unto Isaac, and unto Jacob, by the name of God Almighty, but by my name JEHOVAH was I not known to them. And I have also established my covenant with them, to give them the land of Canaan, the land of their pilgrimage, wherein they were strangers. And I have also heard the groaning of the children of Israel, whom the Egyptians keep in bondage; and I have remembered my covenant.
Wherefore say unto the children of Israel, [u]I am the LORD[/u], and [u]I will[/u] bring you out from under the burdens of the Egyptians, and [u]I will[/u] rid you out of their bondage, and [u]I will[/u] redeem you with a stretched out arm, and with great judgments: And [u]I will[/u] take you to me for a people, and [u]I will[/u] be to you a God: and ye shall know that I am the LORD your God, which bringeth you out from under the burdens of the Egyptians. And [u]I will[/u] bring you in unto the land, concerning the which I did swear to give it to Abraham, to Isaac, and to Jacob; and [u]I will[/u] give it you for an heritage: [u]I am the LORD[/u]. (Ex. 6:1-8, KJVS)
You will find here 7 categoric statements that God promises under His name of Jehovah. This is God's 'mission statement' which He signs before and after with his name Jehovah. If you think slowly through these statements you will discover the New Testament equivalent in the life and ministry of Jesus.