They brought the coin, and he asked them, “Whose portrait is this? And whose inscription?” “Caesar’s,” they replied. Then Jesus said to them, “Give to Caesar what is Caesar’s and to God what is God’s.” And they were amazed at him. Mark 12:16-17
“‘Render to Caesar the things that are Caesar’s and to God the things that are God’s;’ that is, give to Caesar his image stamped upon his coin, and give to God his own image stamped upon you; so that while you render to Caesar the coin which is his due, you may render your own self to God.”
Tertullian of Carthage as recounted by H.D.M. Spence in The Pulpit Commentary (London: Funk and Wagnalls).