The scribes and the chief priests sought to lay hands on him at that very hour, for they perceived that he had told this parable against them, but they feared the people. So they watched him and sent spies, who pretended to be sincere, that they might catch him in something he said, so as to deliver him up to the authority and jurisdiction of the governor. So they asked him, “Teacher, we know that you speak and teach rightly, and show no partiality, but truly teach the way of God. Is it lawful for us to give tribute to Caesar, or not?” But he perceived their craftiness, and said to them, “Show me a denarius. Whose likeness and inscription does it have?” They said, “Caesar's.” He said to them, “Then render to Caesar the things that are Caesar's, and to God the things that are God's.” And they were not able in the presence of the people to catch him in what he said, but marveling at his answer they became silent. (Luke 20:19-26)
Give to Caesar the things that are Caesar's and give to God the things that are God's. The things that belong to Caesar and therefore should be given to him were the things with his likeness or image on them. Therefore the things that belong to God and should be given to Him are the thing made in his image and likeness - us!
God's not after your money, it's much bigger than that. Everything about you belongs to Him, you are made in his image, give yourself to Him.