'Coming' in the Bible

Lo, I am sending My messenger, And he hath prepared a way before Me, And suddenly come in unto his temple Doth the Lord whom ye are seeking, Even the messenger of the covenant, Whom ye are desiring, Lo, he is coming, said Jehovah of Hosts.

And who is bearing the day of his coming? And who is standing in his appearing? For he is as fire of a refiner, And as soap of a fuller.

Lo, I am sending to you Elijah the prophet, Before the coming of the day of Jehovah, The great and the fearful.