Long before offerings were a practice of the Israelite people, Cain and Abel, the second generation of the human race, brought an offering to the Lord. The Lord blessed Abel’s offering, but rejected Cain’s. Abel brought the “firstborn of his flock,” while Cain brought “some of the fruits of the soil” as an offering. God wants to be first.
The following scriptures show how tithing is biblical.
Then Melchizedek king of Salem brought out bread and wine; he was the priest of God Most High. And he blessed him and said: ‘Blessed be Abram of God Most High, Possessor of heaven and earth; and blessed be God Most High, who has delivered your enemies into your hand.’ And he gave him a tithe of all.” – Genesis 14:18-20
“And it shall be, when you come into the land which the Lord your God is giving you as an inheritance, and you possess it and dwell in it, that you shall take some of the first of all the produce of the ground, which you shall bring from your land that the Lord your God is giving you, and put it in a basket and go to the place where the Lord your God chooses to make His name abide.” – Deuteronomy 26:1-2