Paul, Silvanus, and Timothy, to the assembly of the Thessalonians in God the Father and the Lord Jesus Christ: Grace to you and peace from God our Father and the Lord Jesus Christ.
The Lord Jesus Christ ... The name "Lord" as it appears in this compound title of Jesus Christ "is the great Old Testament word which expresses the sovereignty of God, personally and legitimately exercised over the whole universe, animate and inanimate."[3] Thus, our Saviour is recognized here as a member of the Godhead, possessing full deity and entitled to the adoration and worship of all people.  Note also that being "in God" is one and the same thing with being in Christ.