The law of the tithe is not something new to the Restoration; Abraham paid tithes to Melchizedek in ancient times. How does the commandment to pay tithing bless your life?
20 And blessed be the most high God, which hath delivered thine enemies into thy hand. And he gave him tithes of all.
Tithing is a commandment with a promise. The words of Malachi, reaffirmed by the Savior, promise those who bring their tithes into the storehouse that the Lord will open “the windows of heaven, and pour [them] out a blessing, that there shall not be room enough to receive it.” The promised blessings are temporal and spiritual. The Lord promises to “rebuke the devourer,” and he also promises tithe payers that “all nations shall call you blessed, for ye shall be a delightsome land”…
The payment of tithing also brings the individual tithe payer unique spiritual blessings. Tithe paying is evidence that we accept the law of sacrifice. It also prepares us for the law of consecration and the other higher laws of the celestial kingdom. The Lectures on Faith, prepared by the early leaders of the restored Church, part the curtain on that subject when they say:
“Let us here observe that a religion that does not require the sacrifice of all things never has power sufficient to produce the faith necessary unto life and salvation; for, from the first existence of man, the faith necessary unto the enjoyment of life and salvation never could be obtained without the sacrifice of all earthly things.”
We should not think that the payment and blessings of tithing are unique to members of The Church of Jesus Christ of Latter-day Saints. Tithe paying is commanded in the Bible. Abraham paid tithes to Melchizedek. Jacob covenanted to “give the tenth” unto God. After the children of Israel were brought out of Egypt, the prophet Moses commanded that they should give a tenth to the Lord.
Elder Dallin H. Oaks