the one who promised

Jesus promised the Holy Spirit (John 7:37-39) He referred to the "Promise of the Father" (Acts 1:4) Theology states that "the Holy Spirit is from the father and the Son proceeding". He's referred to as the "third Person of the Trinity".  Jesus said in John 14 and that the Holy Spirit would be a Teacher and a Guide. The Christian's  search for truth is led by the Spirit! Praise God!