It’s all of God
1 Thessalonians 5:23-28
23 And the very God of peace sanctify you wholly; and I pray God your whole spirit and soul and body be preserved blameless unto the coming of our Lord Jesus Christ. 24 Faithful is he that calleth you, who also will do it.
25 Brethren, pray for us.
26 Greet all the brethren with an holy kiss. 27 I charge you by the Lord that this epistle be read unto all the holy brethren.
28 The grace of our Lord Jesus Christ be with you. Amen.
The first epistle unto the Thessalonians was written from Athens.