"The Key Of David"

Jesus has "the key of David." Using it, he "opens so that no one will shut, and shuts so that no one will opens." What is this "key of David"?

It was with King David of Israel that Jehovah made a covenant for an everlasting kingdom. (Psalm 89:1-4, 34-37) David's house ruled from Jehovah's throne in Jerusalem from 1070 to 607 B.C. E., but then God's judgment was executed upon that kingdom because it turned to wickedness. Thus Jehovah began to fulfill his prophecy at Ezekiel 21:27 "a ruin, a ruin, a ruin I shall make it [earthly Jerusalem]. As for this also, it [the scepter of kingship in David's line] will certainly become no one's until he comes who has the legal right, and I must give it to him."

When and how would this one with "the legal right" appear? How would the scepter of David's kingdom be given to him?

About 600 years later, a descendant of King David, the Jewish maiden Mary,became pregnant by holy spirit. God sent the angel Gabriel to inform Mary that she would have a son, to be named Jesus. Gabriel added: " This one will be great and will be called Son of the Most High; and Jehovah God will give him the throne of David his father, and he will rule as king over the house of Jacob forever, and there will be no end of his kingdom."- Luke 1:31-33.

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