'Covenant' in the Bible

"I, the Lord, officially commission you; I take hold of your hand. I protect you and make you a covenant mediator for people, and a light to the nations,

My servant is truly blind, my messenger is truly deaf. My covenant partner, the servant of the Lord, is truly blind.

This is what the Lord says: "At the time I decide to show my favor, I will respond to you; in the day of deliverance I will help you; I will protect you and make you a covenant mediator for people, to rebuild the land and to reassign the desolate property.

Even if the mountains are removed and the hills displaced, my devotion will not be removed from you, nor will my covenant of friendship be displaced," says the Lord, the one who has compassion on you.

For this is what the Lord says: "For the eunuchs who observe my Sabbaths and choose what pleases me and are faithful to my covenant,

As for foreigners who become followers of the Lord and serve him, who love the name of the Lord and want to be his servants -- all who observe the Sabbath and do not defile it, and who are faithful to my covenant --

For I, the Lord, love justice and hate robbery and sin. I will repay them because of my faithfulness; I will make a permanent covenant with them.