Mark 12:13-40  This passage in the book of Mark records a series of inquisitions..

First comes the Herodians and Pharisees with a question about paying taxes.  Jesus teaches them that there are things to be rendered to the government, Caesar at that time... but more importantly they should, "Render.. to God the things that are God's."   This answer astonished them and shut them up.
What belongs to God?  Absolutely everything.

We saw from the parable of the vineyard that God owns everything and that the fruit belongs to Him. Those who would try to keep it for themselves will find only destruction.  The religious leaders wanted it all to themselves and were unwilling to hear the truth that they asked for.

How do we render to God that which is His?  The example comes in verses 41-44... "the poor widow came and put in two small copper coins which amount to a cent...And calling His disciples to Him, He said to them, ' Truly I say to you, this poor widow put in more than all the contributors to the treasury; for they all put in out of their surplus, but she, out of her poverty, put in all she owned, all she had to live on.'"   

It is not the size of our gift that matters to God as much as it is the willingness with which we render it..
"... whoever gives you a cup of water to drink... he shall not lose his reward" (Mark 9:41)

 Paul writes: "Let each one do just as he has purposed in his heart; not grudgingly or under compulsion; for God loves a cheerful giver." ( 2 Corinthians 9:7) 

The Old Testament prophets had this to say about rendering to God what is His:

Amos 6:22 "Even though you offer up to Me burnt offerings and your grain offerings, I will not accept them; And I will not even look at the peace offerings of your fatlings. Take away from Me the noise of Your songs; I will not even listen to the sound of your harps.  But, let justice roll down like waters and righteousness like an overflowing stream."

Micah 6: 6-8 "With what shall I come to the Lord and bow myself before the God on high? Shall I come to Him with burnt offerings, with yearling calves? Does the Lord take delight in thousands of rams, in ten thousand rivers of oil? Shall I present my first-born for my rebellious acts, the fruit of my body for my rebellious acts?  The fruit of my body for the sin of my soul? He has told you O man, what is good; and what does  the Lord requires of you but to do justice, to love kindness, and to walk humbly with your God?"

Father, teach us to walk in Your ways and to do Your will.  We lift up our lives to You and pray that Your good Spirit will lead us on level ground. Teach us to give to You what is Yours.. willingly, cheerfully, humbly, and faithfully.  In the Name of our Lord, Jesus Christ we pray. Amen.