Jesus sat down opposite the place where the offerings were put and watched the crowd putting their money into the temple treasury. Many rich people threw in large amounts. But a poor widow came and put in two very small copper coins, worth only a few cents. Calling his disciples to him, Jesus said, “Truly I tell you, this poor widow has put more into the treasury than all the others. They all gave out of their wealth; but she, out of her poverty, put in everything—all she had to live on.  Mark 12:41-44

Jesus provided examples where the acceptable amount to be given or sacrificed varied based on the spiritual and financial condition of the giver:

Mark 10:17-21, Rich Young Ruler (100%)

Luke 19:8-9, Tax Collector (50%)

Mark 12:41-44, Poor Widow (2 small coins) 

Many Christians find the biblical “tithe” (10%) to be an attainable and fruitful goal for giving to the church. 

Then Jacob made a vow, saying, “If God will be with me and will watch over me on this journey I am taking and will give me food to eat and clothes to wear so that I return safely to my father’s household, then the Lord will be my God and this stone that I have set up as a pillar will be God’s house, and of all that you give me I will give you a tenth.”  Genesis 28:20-22

A tithe of everything from the land, whether grain from the soil or fruit from the trees, belongs to the LORD; it is holy to the LORD. . . . Every tithe of the herd and flock—every tenth animal that passes under the shepherd’s rod—will be holy to the LORD.  Leviticus 27:30,32