'Unto' in the Bible

Paul, and Silvanus, and Timotheus, unto the church of the Thessalonians in God our Father and the Lord Jesus Christ:

Grace unto you, and peace, from God our Father and the Lord Jesus Christ.

Now we beseech you, brethren, by the coming of our Lord Jesus Christ, and by our gathering together unto him,

Not because we have not power, but to make ourselves an ensample unto you to follow us.