KJV:
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;
NASB:
For God, whom I serve in my spirit in the preaching of the gospel of His Son, is my witness as to how unceasingly I make mention of you,
KJV:
Cease not to give thanks for you, making mention of you in my prayers;
NASB:
do not cease giving thanks for you, while making mention of you in my prayers;
KJV:
I thank my God upon every remembrance of you,
NASB:
I thank my God in all my remembrance of you,