The Doctrine and Covenants, Section 27:5-14
5 Behold, this is wisdom in me; wherefore, marvel not, for the hour cometh that I will drink of the fruit of the vine with you on the earth, and with Moroni, whom I have sent unto you to reveal the Book of Mormon, containing the fulness of my everlasting gospel, to whom I have committed the keys of the record of the stick of Ephraim;
6 And also with Elias, to whom I have committed the keys of bringing to pass the restoration of all things spoken by the mouth of all the holy prophets since the world began, concerning the last days;
7 And also John the son of Zacharias, which Zacharias he (Elias) visited and gave promise that he should have a son, and his name should be John, and he should be filled with the spirit of Elias;
8 Which John I have sent unto you, my servants, Joseph Smith, Jun., and Oliver Cowdery, to ordain you unto the first priesthood which you have received, that you might be called and ordained even as Aaron;
9 And also Elijah, unto whom I have committed the keys of the power of turning the hearts of the fathers to the children, and the hearts of the children to the fathers, that the whole earth may not be smitten with a curse;
10 And also with Joseph and Jacob, and Isaac, and Abraham, your fathers, by whom the promises remain;
11 And also with Michael, or Adam, the father of all, the prince of all, the ancient of days;
12 And also with Peter, and James, and John, whom I have sent unto you, by whom I have ordained you and confirmed you to be apostles, and especial witnesses of my name, and bear the keys of your ministry and of the same things which I revealed unto them;
13 Unto whom I have committed the keys of my kingdom, and a dispensation of the gospel for the last times; and for the fulness of times, in the which I will gather together in one all things, both which are in heaven, and which are on earth;
14 And also with all those whom my Father hath given me out of the world.
The Doctrine and Covenants, Section 27:5,14
5 Behold, this is wisdom in me; wherefore, marvel not, for the hour cometh that I will drink of the fruit of the vine with you on the earth…
14 And also with all those whom my Father hath given me out of the world.
Doctrine and Covenants Student Manual, Bruce R. McConkie
Every faithful person in the whole history of the world, every person who has so lived as to merit eternal life in the kingdom of the Father will be in attendance and will partake, with the Lord, of the sacrament.