Spirit of the Lord
The spirit of the Lord is also called the Holy Spirit, the Holy Ghost, the Spirit of God, Spirit, and the Comforter. His name titles Spirit of Truth and Holy Spirit of Promise reference the power given to him to ratify and approve the righteous acts of men and women so that those acts will be binding on earth and in heaven. (See Doctrine and Covenants 132:7). He is a member of the Godhead and witnesses, or testifies of Heavenly Father and Jesus Christ, and reveals and teaches the truth.
According to the Bible Dictionary, the term "spirit of the Lord" is sometimes synonymous to the phrase "Light of Christ," so the term "must not be take in every case" as having reference to the Holy Ghost.