The only two times tithing is mentioned by Christ in the NT, it is in relation to people that Christ shows to be unworthy. Mat 23:23-24 “Woe to you, scribes and Pharisees, hypocrites! For you pay tithe of mint and anise and cummin, and have neglected the weightier matters of the law: justice and mercy and faith. These you ought to have done, without leaving the others undone. 24 Blind guides, who strain out a gnat and swallow a camel!"
Luke 11 also has the same rebuke. Luke 18:9 Also He spoke this parable to some who trusted in themselves that they were righteous, and despised others: 10 “Two men went up to the temple to pray, one a Pharisee and the other a tax collector. 11 The Pharisee stood and prayed thus with himself, ‘God, I thank You that I am not like other men—extortioners, unjust, adulterers, or even as this tax collector. 12 I fast twice a week; I give tithes of all that I possess.’ 13 And the tax collector, standing afar off, would not so much as raise his eyes to heaven, but beat his breast, saying, ‘God, be merciful to me a sinner!’ 14 I tell you, this man went down to his house justified rather than the other; for everyone who exalts himself will be humbled, and he who humbles himself will be exalted.”[/color]
In Matthew 23 Christ also listed the things that the Pharasees and scribes tithed, and it was not cash. Yet they certainly had cash currency. They didn't pay Judas in mint and cumin. They didn't pay taxes to Rome in mint and cumin. Here's all the proof you need....... Matthew 22:15 Then the Pharisees went and plotted how they might entangle Him in His talk. 16 And they sent to Him their disciples with the Herodians, saying, “Teacher, we know that You are true, and teach the way of God in truth; nor do You care about anyone, for You do not regard the person of men. 17 Tell us, therefore, what do You think? Is it lawful to pay taxes to Caesar, or not?”
18 But Jesus perceived their wickedness, and said, “Why do you test Me, you hypocrites? 19 Show Me the tax money.”
So they brought Him a denarius.
20 And He said to them, “Whose image and inscription is this?”
21 They said to Him, “Caesar’s.”
And He said to them, “Render therefore to Caesar the things that are Caesar’s, and to God the things that are God’s.” 22 When they had heard these words, they marveled, and left Him and went their way.