Matthew 6:33
But seek first his kingdom and his righteousness, and all these things will be given to you as well.

Haggai 1:6
You have planted much, but harvested little. You eat, but never have enough. You drink, but never have your fill. You put on clothes, but are not warm. You earn wages, only to put them in a purse with holes in it.”

The principle of firsts
1) The firstborn belongs to God.

Exodus 13:2
“Consecrate to me every firstborn male. The first offspring of every womb among the Israelites belongs to me, whether human or animal.”

Colossians 1:15
15  The Son is the image of the invisible God, the firstborn over all creation.

2) The first tenth belongs to God.

Leviticus 27:30
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.

Matthew 6:21
For where your treasure is, there your heart will be also.

Genesis 4:2b-5a
2 Now Abel kept flocks, and Cain worked the soil. 3 In the course of time Cain brought some of the fruits of the soil as an offering to the Lord. 4 And Abel also brought an offering—fat portions from some of the firstborn of his flock. The Lord looked with favor on Abel and his offering, 5 but on Cain and his offering he did not look with favor.

Malachi 3:10a
10  Bring the whole tithe into the storehouse, that there may be food in my house.

Malachi 3:8-9
“Will a mere mortal rob God? Yet you rob me. “But you ask, ‘How are we robbing you?’ “In tithes and offerings.

Malachi 3:10
10  Bring the whole tithe into the storehouse, that there may be food in my house. Test me in this,” says the Lord Almighty, “and see if I will not throw open the floodgates of heaven and pour out so much blessing that there will not be room enough to store it.

It requires faith to give first.  If you give last, it doesn’t require faith.

Hebrews 11:6
And without faith it is impossible to please God, because anyone who comes to him must believe that he exists and that he rewards those who earnestly seek him.

Mark 12:41-44
41 Jesus sat down opposite the place where the offerings were put and watched the crowd putting their money into the temple treasury. Many rich people threw in large amounts. 42 But a poor widow came and put in two very small copper coins, worth only a few cents. 43 Calling his disciples to him, Jesus said, “Truly I tell you, this poor widow has put more into the treasury than all the others. 44 They all gave out of their wealth; but she, out of her poverty, put in everything—all she had to live on.”

Proverbs 3:9-10
9 Honor the Lord with your wealth, with the firstfruits of all your crops; 10 then your barns will be filled to overflowing, and your vats will brim over with new wine.

Romans 5:8
But God demonstrates his own love for us in this: While we were still sinners, Christ died for us.

God gave before we believed

2 Corinthians 8:5
5  And they exceeded our expectations: They gave themselves first of all to the Lord, and then by the will of God also to us.