For God is my witness, whom I serve with my spirit in the gospel of his Son, that without ceasing I make mention of you always in my prayers;
Romans 1:9
King James Version (public domain)
Traditionally attributed to Paul · 1st century AD · Thirteen epistles of the New Testament are traditionally attributed to him
Context
7To all that be in Rome, beloved of God, called to be saints: Grace to you and peace from God our Father, and the Lord Jesus Christ.
8First, I thank my God through Jesus Christ for you all, that your faith is spoken of throughout the whole world.
9For God is my witness, whom I serve with my spirit in the gospel of his Son, that without ceasing I make mention of you always in my prayers;
10Making request, if by any means now at length I might have a prosperous journey by the will of God to come unto you.
11For I long to see you, that I may impart unto you some spiritual gift, to the end ye may be established;