Faithful is he that calleth you, who also will do it.
1 Thessalonians 5:24
King James Version (public domain)
Traditionally attributed to Paul · 1st century AD · Thirteen epistles of the New Testament are traditionally attributed to him
Context
22Abstain from all appearance of evil.
23And 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.
24Faithful is he that calleth you, who also will do it.
25Brethren, pray for us.
26Greet all the brethren with an holy kiss.