God's way of giving was introduced to the world 430 years before the law, Gal 3:17 And this I say, that the covenant, that was confirmed before of God in Christ, the law, which was four hundred and thirty years after, cannot disannul, that it should make the promise of none effect. Abraham gave tithes long before the law, Gen 14:20 And blessed be the most high God, which hath delivered thine enemies into thy hand. And he gave him tithes of all. He gave to the LORD because of the victory God hath given him.
Giving to the LORD has not changed; it is still the same for the Church today: Giving is acknowledging a debt God paid for us that we could not pay our self. Christ suffered the judgment of God for our sin, 1 Peter 2:24-25 Who his own self bare our sins in his own body on the tree, that we, being dead to sins, should live unto righteousness: by whose stripes ye were healed. For ye were as sheep going astray; but are now returned unto the Shepherd and Bishop of your souls.
The law is subject to Christ: the law gave tithes to the LORD, Heb 7:9-10 And as I may so say, Levi also, who receiveth tithes, payed tithes in Abraham. For he was yet in the loins of his father, when Melchisedec met him.
The law cannot be use as a reason to not give first fruits to our LORD. It would only be through a lack of knowledge that one would not give. We give because we love Him: We love Him because He gave Himself for us; we love Him because we know Him, 1 Peter 2:7 Unto you therefore which believe he is precious : but unto them which be disobedient, the stone which the builders disallowed, the same is made the head of the corner,
One cannot see His preciousness from the outside: there was a nine-foot fence around the tabernacle so you could not see from the outside. One had to enter by the sin offering: for Him to be precious you must believe Him as your Saviour, He is only precious to who believes, 1Pe 2:7 "Unto you therefore which believe he is precious:...." 1 John 2:25 And this is the promise that he hath promised us, even eternal life. He promised you eternal life for believing on Him
<