Read Malchi 3 : 8 thru 12 if you want to know what God almighty says about it.
Yes, but this is Old Testament. The Jews were given the law by Moses - well, God through Moses. That law included tithing, and if you read Deuteronomy 14:22-29 - for example - you will see instructions about how these tithes were to be made.
1. A person had to set aside a tenth of all that their fields produced each year.
2. They could eat their tithe of grain, new wine and oil. They were not to do so in their own home towns, but had to go to a place that the Lord chose for them.
3. If this place was too far away, they could exchange this tithe for silver, go to the designated place, buy what they wanted when they were there - cattle or whatever and, together with their family, eat it there in the presence of God with much rejoicing.
4 They were not to neglect the Levites who had no allotments or inheritance of their own.
5. Every 3 years all the tithes were to be stored in their own towns so that Levites, orphans, widows etc could eat and be satisfied.
So the tithe was for eating, and feeding those in need.
The verse in Malachi just says that the people were not offering
all their tithes, which were commanded by law, to the Lord. Maybe they were just holding back - only giving 7% or whatever; maybe they were using false weights and measures to measure out a tenth. This was also illegal, and the Lord condemned people for doing this, (Deut 25:13-16; Proverbs 11:1; 16:11; Hosea 12:7)
A similar thing happened in the NT, in Acts 5. Ananais and Saphira were not condemned for not giving all their money to God, they were condemned because they lied to the apostles and claimed that they were giving more to God's work than they actually were.
Whatever the case, it's clear from the OT what the tithe was, and if a person claims that they tithe according to Scripture, this is what they should be doing.
Deciding to give 10% of your wages to your local church to support its work and ministry is good - don't get me wrong. But it is not a practice laid down in Scripture.