The issue with tithing is much about what religion leaders interpret it to be with the book of Malachi where it says there's a curse for not paying tithes. However, the Bible says Jesus fulfilled the law, which means the curse of Malachi no longer have effects.
Jesus teaching on giving were not on tithing, His mentioned on tithing was on the negative. Read Mathews 23:23
“Woe to you, teachers of the law and Pharisees, you hypocrites! You give a tenth of your spices—mint, dill and cumin. But you have neglected the more important matters of the law—justice, mercy and faithfulness. You should have practiced the latter, without neglecting the former.
In respect to Matthew 23: 23 Jesus never condemned tithing, rather it means we should not be selective in obeying God's commandments. Here God is not after our sacrifice but mercy, faith and justice, see Matthew 9:13,12:7.Paying tithes doesn't make one righteous but Our is through Jesus.
Emphasy on "WITHOUT NEGLECTING THE FORMER"
What is the former thing he mentioned? Paying tithes of all.
By Jesus statement, he meant that the Pharisees were neglecting justice, mercy and faithfulness, but paying tithes, that they should have practiced both Justice, mercy, faithfulness and tithing.
It's such a clear statement brethren.
Nonetheless, Not paying of tithes is not a sin, tithing in the new testament is a mystery. If you believe in it, that by doing so, God will open windows of heaven for you and rebuke devourers, fine. If you don't believe, still fine.
But note that when Abraham paid tithes, he wasn't an Israelite, Israelites came out from him, including Moses,so when they say that TITHING was for Israelites, they should explain why Abraham paid it when he wasn't an Israelite.
Every blessings pronounced in the Bible are still valid, whether in Moses era of Christian era.
Job 36:11
Malachi 3:10-11
All the blessings above a valid till the end of the world, if we harken to them.
Shalom!