The Holy Ghost is part of the godhead in which we believe.
Sent by the Father in Christ's name.
Sent by Christ from the Father.
"Spirit of Truth"
Shall testify of Christ.
Will show things to come.
Will guide in all truth.
Will glorify Christ.
Would not come (as Gift) until after Christ's Death.
While seeking the brass plates, Nephi is guided by the spirit and commanded to kill Laban.