The Messiah will have Elijah blow the trumpet, and, at the first sound, the primal light, which shone before the week of Creation, will reappear; at the second sound the dead will arise, and with the swiftness of wind assemble around the Messiah from all corners of the earth; at the third sound, the Shekinah will become visible to all; the mountains will be razed at the fourth sound, and the Temple will stand in complete perfection as Ezekiel described it.
During the reign of peace, Elijah will be one of the eight princes forming the cabinet of the Messiah. Even the coming of the great judgment day will not end his activity. On that day the children of the wicked who had to die in infancy on account of the sins of their fathers will be found among the just, while their fathers will be ranged on the other side. The babes will implore their fathers to come to them, but God will not permit it. Then Elijah will go to the little ones, and teach them how to plead in behalf of their fathers. They will stand before God and say: "Is not the measure of good, the mercy of God, larger than the measure of chastisements? If, then, we died for the sins of our fathers, should they not now for our sakes be granted the good, and be permitted to join us in Paradise?" God will give assent to their pleadings, and Elijah will have fulfilled the word of the prophet Malachi; he will have brought back the fathers to the children.