"Now about the collection for the saints, you are to do as I directed the churches of Galatia: On the first day of every week, each of you should set aside a portion of his income, saving it up, so that when I come no collections will be needed. Then, on my arrival, I will send letters with those you recommend to carry your gift to Jerusalem. And if it is advisable for me to go also, they can travel with me."

Paul sets forth what it means to give. In the New Testament, after the resurrection, there's no mention of tithing, because we're under a new covenant.

First, giving is not a tithe. No mention is made of tithing, because we give as we purpose in our heart.

“So let each one give as he purposes in his heart, not grudgingly or of compulsion; for God loves a cheerful giver.” --2 Cor 9:7

Many take the new covenant and being under grace as an excuse for selfishness, but grace must be taught anyway: We do no good by holding it back. Simply teach its fullness, and how it makes us act and think. Grace makes us willing to give for God's glory in thankfulness, when properly understood.

Secondly, giving is not to get more money; it's to help others.

Paul said, “Now concerning the collection for the saints… On the first of the week let each one of you lay something aside, storing up as he may prosper… your gift to Jerusalem.”

I'm surprised there are so few tithers in churches that preach tithing, but if tithing was the key to wealth, Africa would be rich. (If people saw it working, maybe they'd tithe more.)

Giving, however, meets the needs of poor saints, supports those who labor in the word and teaching, and it helps us advance the gospel to the world. We’ve been instructed to support poor widows who’ve proven faithful [1 Tim 5]. We support the orphaned children of the saints. This is pure religion [James 1:27].

Thirdly, we're not under old testament law. You can't just take tithing and hold it before the people! You have to keep the whole law, but it was nailed to the cross.

“Having abolished in His flesh the enmity, the law of commandments in ordinances, so as to created in Himself one new man,”

“Having wiped out the certificate of debt that was contrary to us. And he has taken it out of the way, having nailed it to the cross.”

“You are not under law but under grace.”

The new testament is entirely sufficient to teach us how to live, because we read the old testament with new testament eyes. Christ put away the law, so we are not under the sabbath.

“So let no one judge you in food or in drink, or regarding a feast or a new moon or sabbaths, which are a shadow of things to come, but the substance is of Christ.” Col 2:16-17

We walk by faith, which works by love. Love is the essence of the law, and by the gospel we keep this command.

“For he who loves another has fulfilled the law,” --Rom 13:8

Give as God's provided for you. Everything is His. Ask Him how much, and give cheerfully, knowing that He is your provider, but NEVER as a transaction to get rich.