Deuteronomy 14:28: “At the end of every three years you shall bring out all the tithe of your produce in the same year and lay it up within your towns.
When you read the above verse, it gives you the impression that the law of the tithe is not straight-forward at all. Here, there is a description of what to do every three years. So if we want to uphold the law of the tithe in the time we are in under the new testament of the grace of Jesus and not the law, why not be true to the law as it is?
And while you are at it, why not obey the law of the Sabbath. While you are at it, why not embrace the culture of not wearing two different clothes with different textures at the same time (Deuteronomy 22:9-11)? According to Paul, if you want to obey one part of the law, you have made yourself a debtor to obey everything and to transgress one is to transgress all (Galatians 5:1-10).
So what should we do with the whole gamut of law concerning giving in the Old Testament, the two major ones being first fruits and tithe? Should we then tear them out of the bible because now we are under grace? Are they now irrelevant to us in the life of faith in Christ Jesus? Nothing can be far from the truth.
Jesus said that he has not come to abolish the law but to fulfil them (Matthew 5:17). Because He is in us, the law is fulfilled in us. And it is based on that that Paul said that the demand of the law is fulfilled in us (not by us) who walk after (in) the Spirit and not after (in) the flesh (Romans 8:3-4).
That was why in His life-time, according to those who recorded it, Jesus showed as far as he was concerned, the list of dos and don’ts in the law are summed into one- the law of love (Mark 12:28-34, Romans 13:8-10, Galatians 5:14, Luke 10:). Lest you think that is such a heavy burden, since you don’t know how to love because nobody ever showed you love since you were born, Paul showed us that loving is not what we try to do, it is a quality that has been poured out in our hearts by the Holy Spirit, who is given to us once we are in Christ (Romans 3:20-22, 27-28). In Christ we have the ability to love.
Since the whole law is reduced to one- love God and one other, and the Holy Spirit that we have as Christian has shed abroad in our heart the love of God, it is in that context that we understand that the law is fulfilled in us.