Tithe, in Hebrew, means tenth.
Old Testament
30 “‘A tithe of everything from the land, whether grain from the soil or fruit from the trees, belongs to the Lord; it is holy to the Lord.
Leviticus 27:30
New International Version
Honor the Lord with your wealth, with the first fruits of all your crops;
Proverbs 3:9
New International Version
New Testament
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.
Matthew 23:23
New International Version
7 Each of you should give what you have decided in your heart to give, not reluctantly or under compulsion, for God loves a cheerful giver.
2 Corinthians 9:7
New International Version