When you have come into the land that the Lord your God is giving you as an inheritance to possess, and you possess it, and settle in it, 2you shall take some of the first of all the fruit of the ground, which you harvest from the land that the Lord your God is giving you, and you shall put it in a basket and go to the place that the Lord your God will choose as a dwelling for his name. 3You shall go to the priest who is in office at that time, and say to him, “Today I declare to the Lord your God that I have come into the land that the Lord swore to our ancestors to give us.” 4When the priest takes the basket from your hand and sets it down before the altar of the Lord your God, 5you shall make this response before the Lord your God: “A wandering Aramean was my ancestor; he went down into Egypt and lived there as an alien, few in number, and there he became a great nation, mighty and populous. 6When the Egyptians treated us harshly and afflicted us, by imposing hard labor on us, 7we cried to the Lord, the God of our ancestors; the Lord heard our voice and saw our affliction, our toil, and our oppression. 8The Lord brought us out of Egypt with a mighty hand and an outstretched arm, with a terrifying display of power, and with signs and wonders; 9and he brought us into this place and gave us this land, a land flowing with milk and honey. 10So now I bring the first of the fruit of the ground that you, O Lord, have given me.” You shall set it down before the Lord your God and bow down before the Lord your God. 11Then you, together with the Levites and the aliens who reside among you, shall celebrate with all the bounty that the Lord your God has given to you and to your house. (Deuteronomy 26:1-11, NRSV)
When we were a nation in peril, God saved us. God asks us to, therefore, give him the first fruits of our labors.
We should give to God first and foremost, not secondary or as an afterthought.
God is to get the first fruits of our labors because God has blessed us with the labor we have and we only have what we get because God has blessed us. So in actuality, we are only returning to God what is already God’s.