We give because: “He which soweth sparingly shall reap also sparingly; and he which soweth bountifully shall also reap bountifully. Every man, according as he purposes in his heart so let him give; not grudgingly or of necessity; for God loveth a cheerful giver. And God is able to make all grace abound toward you; that you, always having all sufficiency in all things, may abound to every good work.” (II Corinthians 9:6-8)

Because we bring God His tithes and an offering, God promises to give us seed (money) because we give. Also we can expect bonuses at our jobs, promotions, people giving us money because we give, new contracts, inheritance, record deals, engagements, royalties, book deals, publications, new businesses, dividends, residual income, debt cancellation and any other stream of income God has designed for ME.

Scriptural giving is one of the fundamentals of the Faith:
“Therefore, as ye abound in everything, in faith, and utterance, and knowledge, and in all diligence, and in your love to us, see that ye abound in this grace also.” 2 Corinthians 8:7

We are commanded to bring our gifts into the storehouse (common treasury of the church) upon the first day of the week.
“Upon the first day of the week let every one of you lay by him in store, as God hath prospered him, that there be no gatherings when I come.” 1 Corinthians 16:2

Under Grace we give, and do not pay, the tithe.
“Abraham GAVE the tenth of the spoils,” Hebrews 7:2, 4

“and this was four hundred years before the law, and is confirmed in the New Testament; Jesus said concerning the tithe, “these ought ye to have done.” Matthew 23:23

We are commanded to bring the tithe into the common treasury of the church.
“The tithe … is the Lord’s.” Leviticus 27:30

“Bring ye all the tithes into the storehouse, that there may be meat in mine house, and prove me now herewith, saith the Lord of hosts, if I will not open you the windows of heaven, and pour you out a blessing, that there shall not be room enough to receive it.” Malachi 3:10

In the New Testament, it was the common treasury of the church.
“And brought the prices of the things that were sold and laid them down at the apostles’ feet … Having land, sold it, and brought the money, and laid it AT THE APOSTLES’ FEET.” Acts 4:34,35,37